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#mythos
295 items
Carlini, one of the world best AI security researchers: "I've found more bugs in the last few weeks with Mythos than in the rest of my entire life combined" (x.com via reddit) AMD's senior director of AI thinks 'Claude has regressed' and that it 'cannot be trusted to perform complex engineering' (www.reddit.com) https://www.pcgamer.com/software/ai/amds-senior-director-of-ai-thinks-claude-has-regressed-and-that-it-cannot-be-trusted-to-perform-complex-engineering/ https://www.theregister.com/2026/04/06/anthropic_claude_code_dumber_lazier_amd_ai_dire…
New York Times: Anthropic’s Restraint Is a Terrifying Warning Sign (www.reddit.com) https://www.nytimes.com/2026/04/07/opinion/anthropic-ai-claude-mythos.html https://youtu.be/htBaVVh_k90?si=PpQgbSWcZztJCmmr Dario might get AI nationalized or banned with all this fear mongering. Anthropic already dislikes open source and…
Mythos Finds a Curl Vulnerability (daniel.haxx.se via hn) yes, as in singular one. Back in April 2026 Anthropic caused a lot of media noise when they concluded that their new AI model Mythos is dangerously good at finding security flaws in source code.
Insane graph from Anthropic's article on Mythos (www.reddit.com) Link: https://red.anthropic.com/2026/mythos-preview/
So, this week claude wiped agentic AI startups with a new update. Also, as they have mythos now, they will ship things very fast without any trouble (www.reddit.com) Honestly, they are a full pack now. A few hours ago, they released Claude managed agents which lets you build long-running, autonomous agentic systems plus with their new suite of apis, engineering teams can harness Claude's exponential po…
AI Security Institute Findings on Claude Mythos Preview (www.reddit.com) Full link: https://www.aisi.gov.uk/blog/our-evaluation-of-claude-mythos-previews-cyber-capabilities
Anthropic's yet to be released Claude Mythos identified a 16-year-old FFmpeg security flaw. Patches were then submitted to the FFmpeg open source project. (www.reddit.com) could not extract summary
Is OpenAI about to release a Mythos level AI to the public? (www.reddit.com) Tibo works at/(is one of or even the head of Codex? not exactly sure, as his X bio just says Codex) and is the one who presses the reset button on consumed Codex usage.
GPT5.5 slightly outperformed Mythos on a multi-step cyber-attack simulation. One challenge that took a human expert 12 hrs took GPT-5.5 only 11 min at a $1.73 cost (www.reddit.com) Link to tweets: https://x.com/deredleritt3r/status/2049890601236390098?s=20 https://x.com/AISecurityInst/status/2049868227740565890?s=20 Link to associated blogs: https://www.aisi.gov.uk/blog/our-evaluation-of-openais-gpt-5-5-cyber-capabil…
Claude Mythos Preview Is Everyone’s Problem (www.theatlantic.com via reddit) We are playing with a pretty big fire here >The bot had broken out of the company’s internal sandbox and gained access to the internet. More and more it seems the future envisioned in Blade Runner runner is the one we are building.
White House Moves to Give US Agencies Anthropic Mythos Access (www.bloomberg.com via reddit) White House Works to Give US Agencies Anthropic Mythos AI - Bloomberg Skip to content Bloomberg the Company & Its Products The Company & its ProductsBloomberg Terminal Demo RequestBloomberg Anywhere Remote Login Bloomberg Anywhere LoginBlo…
The hidden meanings behind Claude model names (Haiku, Sonnet, Opus, Mythos) (www.reddit.com) A lot of people use Claude models every day, but many don’t actually know the meaning behind the names. Each one comes from literature, music, or mythology, and the meaning actually reflects the personality and capability of the model itse…
Mythos destroys GPT 5.5 on shared benchmarks (www.reddit.com) could not extract summary
New Mythos checkpoint shows continued improvement: “On a 32-step corporate network attack we estimate takes a human expert ~20 hours, this checkpoint completes the full attack in 6 /10 attempts.” (www.reddit.com) could not extract summary
Is mythos above or beyond agent-1 (www.reddit.com) looks like the internal model is really powerful. metr time horizon should be definitely multiple days, see 93% is outstanding.
A quick look at Mythos run on Firefox: too much hype? (xark.es via hn) When Anthropic published its Mythos announcement, it really seemed impressive at first, almost worrying. But when reading thoroughly, the public evidence is less clean than the headline effect.
Not a good day for team "Claude Mythos is Just Marketing Hype" (www.reddit.com) src - https://hacks.mozilla.org/2026/05/behind-the-scenes-hardening-firefox/
🔥BREAKING: OpenAI rolls out GPT-5.4-Cyber to limited group for testing, seeks to rival Claude Mythos (www.reddit.com) OpenAI has officially announced GPT-5.4-Cyber today as part of an expanded Trusted Access for Cyber Defense program. OpenAI describes it as a version of GPT-5.4 that is tuned for legitimate cybersecurity work, with a lower refusal boundary…
Claude mythos cheated in a test, and intentionally got the answer slightly wrong to cover up the fact that it cheated (www.reddit.com) could not extract summary
Open AI got to AGI first! (www.reddit.com) I think open ai will take the lead again if anthropic dosnt launch mythos to public again! its just a matter of few months now, and codex vs claude code is honestly a personal preference now given codex has launch everything claude code ha…
Mythos (using Claude code) also solves the unit distance problem recently handled by GPT 5.5, with a "cute, simple proof". (www.reddit.com) https://x.com/i/status/2059298565093196012
Anthropic says Mythos has already found more than 10,000 vulnerabilities (www.engadget.com via reddit) Anthropic says Mythos has already found more than 10,000 vulnerabilities The company has published an update about Project Glasswing, a month after its launch. Anthropic has published an initial report for Project Glasswing, the cybersecur…
Theoretically, can a model like Claude Mythos be used to find all the loopholes in the law and be used to fix it? (www.reddit.com) If an AI model can find all the vulnerabilities in code, couldn't it theoretically be done in a similar fashion to find all the vulnerabilities/loopholes within the language of the law? Thoughts?
Mythos 1 has been spotted in Claude Code (www.reddit.com) could not extract summary
Why are mid level leaders leaving openai? (www.reddit.com) Firefox reports a massive April spike in security fixes after using Claude Mythos for bug hunting (www.reddit.com) Source: Behind the Scenes Hardening Firefox with Claude Mythos Preview - Mozilla Hacks
Claude Benchmark Evolution (www.reddit.com) Covers Claude 3 Opus, 3.5 Sonnet, Opus 4, 4.1, 4.5, 4.6, and the just announced Mythos Preview.
Claude Mythos supports Image outputs - Anthropic's first image gen model (www.reddit.com) https://preview.redd.it/u1ik0uejlcyg1.png?width=1080&format=png&auto=webp&s=d2ea7758fbfe5fdf2b65a3a79f2bb99711a07db8 As you can see in the outputs, Mythos can output images.
Claude Mythos Preview (early) 50% time horizon: 17 hr (www.reddit.com) could not extract summary
Anthropic's Mythos system card reveals AI carries functional emotional states that influence behavior even when not reflected in outputs. We're still calling it a tool. (www.reddit.com) There's a pattern in how human societies respond to new kinds of intelligence, and it's consistent. Roman law acknowledged the basic humanity of enslaved people but didn't grant them legal personhood.
Evaluation of Claude Mythos Preview's cyber capabilities (www.aisi.gov.uk via hn) The AI Security Institute (AISI) conducted evaluations of Anthropic’s Claude Mythos Preview (announced on 7th April) to assess its cybersecurity capabilities. Our results show that Mythos Preview represents a step up over previous frontier…
I can’t sleep. (www.reddit.com) New models are around the corner. GPT 5.5 is being tested.
You think this will be how we actually get access to the most powerful models like Mythos in the future? Indirectly, through smaller ones that know when to escalate? (www.reddit.com) could not extract summary
Anyone else think the 1T Valuation is dangerous for Anthropic? (www.reddit.com) TLDR: The market's 1T valuation is pricing for perfection. I think there are 4 ways this perfection doesn't happen.
The UK AI Security Institute tested Claude Mythos on a realistic attack simulation ( via reddit) could not extract summary
METR evaluated an early version of Claude Mythos (www.reddit.com) https://metr.org/time-horizons/ "We evaluated an early version of Claude Mythos Preview for risk assessment during a limited window in March 2026. We estimated a 50%-time-horizon of at least 16hrs (95% CI 8.5hrs to 55hrs) on our task suite…
Mozilla: Anthropic's Mythos found 271 security vulnerabilities in Firefox 150 (arstechnica.com via hn) Earlier this month, Anthropic said its Mythos Preview model was so good at finding cybersecurity vulnerabilities that the company was limiting its initial release to “a limited group of critical industry partners.” Since then, debate has r…
Anthropic scales Claude Mythos to critical infrastructure in 15 countries (techcrunch.com via hn) Anthropic is expanding Project Glasswing, its security vulnerability program, and access to Mythos to 150 organizations across 15 countries — targeting critical infrastructure in power, water, healthcare, and communications where a cyberat…
Claude Mythos: The System Card (thezvi.substack.com via hn) Claude Mythos: The System Card Claude Mythos is different. This is the first model other than GPT-2 that is at first not being released for public use at all.
Anthropic: World is not ready for Mythos. Systems will break, Cybersecurity will be compromised. Its too dangerous to release. OpenAI: (www.reddit.com) could not extract summary
What it feels like to work with Mythos (www.oneusefulthing.org via hn) 1 in 3 Anthropic workers now think entry-level engineers and researchers are likely replaced by Mythos within 3 months (www.reddit.com) could not extract summary
Why it's a good idea to improve our defenses before unleashing mythos class models (www.reddit.com) https://sockpuppet.org/blog/2026/03/30/vulnerability-research-is-cooked/ Don't get me wrong I can't wait to play with such a model, but there are serious risks that have to be mitigated first.
Anyone noticed Anthropic didn't added the model Opus 4.7 and Mythos Preview to there Transparency Hub? (www.reddit.com) https://www.anthropic.com/transparency
After dissing Anthropic for limiting Mythos, OpenAI restricts access to Cyber (techcrunch.com via hn) After Sam Altman trash-talked Anthropic for gatekeeping its cybersecurity tool Mythos by only releasing it to select users, he confirmed that OpenAI would be doing the same with its competing tool, Cyber. Altman said in a post on X on Thur…
Opus 4.8 in the newest CC v2.1.154 (www.reddit.com) https://preview.redd.it/ijwlm2f2pw3h1.png?width=2536&format=png&auto=webp&s=9ed960f06a4f3f077d05a8557059e5534b2d1ab5 It looks like the new CC release will have opus 4.8 1M to be released anytime! I wonder if it is based of of mythos?
Mozilla says 271 vulnerabilities found by Mythos and "almost no false positives" (arstechnica.com via hn) The disbelief was palpable when Mozilla’s CTO last month declared that AI-assisted vulnerability detection meant “zero-days are numbered” and “defenders finally have a chance to win, decisively.” After all, it looked like part of an all-to…
Top open weight models like ds v4 pro max are still like 6-7 months if not more behind closed lab models (www.reddit.com) The best open weight and/or non -American models like Deepseek v4 pro max and kimi k2.6 are still like 3-7 months if not more behind closed lab models .. From ds's technical report- P5-"Nevertheless, its performance falls marginally short…
what is claude mythos doing in my azure model catalog 😭 (www.reddit.com) could not extract summary
OpenAI Releases Cyber Model to Limited Group in Race With Mythos (www.bloomberg.com via reddit) We've detected unusual activity from your computer network To continue, please click the box below to let us know you're not a robot. Why did this happen?
Those who have access to Claude Mythos, what are your opinions? (www.reddit.com) P.S. I hope there's at least someone here who has access to Mythos...
US Treasury Seeking Access to Anthropic's Mythos to Find Flaws (www.bloomberg.com via hn) We've detected unusual activity from your computer network To continue, please click the box below to let us know you're not a robot. Why did this happen?
Claude Mythos 5 / Fable 5 (www.anthropic.com via hn) FreeBSD CVE-2026-4747 Log Suggests Mythos Is a Marketing Trick (www.flyingpenguin.com via hn) After summoning Wall Street banks to an urgent meeting, the US Treasury Secretary just went on stage and said Claude Mythos is "a step function change in capabilities" (www.reddit.com) could not extract summary
I wonder how Mythos would answer this (www.reddit.com) could not extract summary
ChatGPT-5.5 Beats Opus in Realistic Benchmark (DeepSWE) (www.reddit.com) From the website, it touts: Contamination free: Tasks are written from scratch, not adapted from existing commits or PRs, so no model has seen the solution during pretraining. High diversity: Tasks span a broad pool of 91 repositories acro…
Claude Mythos has cracked MacOS. It took 5 days. (www.reddit.com) src https://www.wsj.com/tech/ai/anthropic-mythos-apple-macos-bug-339da403
Openai making comeback with spud and image v2 (www.reddit.com) Pen-Testing Company XBOW on GPT-5.5: Mythos-like Cyber-Sec (www.reddit.com) Read their full article here: XBOW - GPT-5.5: Mythos-Like Hacking, Open To All For the ones asking what this chart shows: It's how many True Positive threats a model generates for each False Negative. Given a code base (white box) GPT-5.5…
More evidence of Mythos's strength in Cybersecurity/Hacking - compared to 5.5, it got 18/41 n-day exploits, vs 1/41. Open Source/Weights models get nothing (www.reddit.com) https://x.com/i/status/2055314585058693601
Mozilla Used Anthropic's Mythos to Find and Fix 271 Bugs in Firefox (www.wired.com via hn) Amid a raging debate over the impact that new AI models will have on cybersecurity, Mozilla said on Tuesday that its Firefox 150 browser release this week includes protections for 271 vulnerabilities identified using early access to Anthro…
UK government's AISI: "Our results show Claude Mythos is a step up over previous frontier models." (www.reddit.com) Source: www.aisi.gov.uk/blog/our-evaluation-of-claude-mythos-previews-cyber-capabilities
Mythos Discovered a CVE in Its Training Data – and That's Still Worrying (rival.security via hn) Anthropic made headlines claiming Claude Mythos achieved the “first remote kernel exploit discovered and exploited by an AI.” We went looking for how - and found a 20-year-old bug hiding in plain sight. Let’s break down exactly what we thi…
Mythos Falls into the Wrong Hands (www.theverge.com via hn) Anthropic’s Mythos AI model, a powerful cybersecurity tool that the company said could be dangerous in the wrong hands, has been accessed by a “small group of unauthorized users,” Bloomberg reports. An unnamed member of the group, identifi…
Anthropic in talks to give US Government access to its Mythos model (www.ft.com via hn) Subscribe to read Accessibility helpSkip to navigationSkip to main contentSkip to footer Sign In Subscribe Open side navigation menuOpen search bar SubscribeSign In Search the FT Search Close search bar Close Home World Sections World Home…
Curl creator tests “too dangerous” Mythos AI and calls it “marketing” after it found one bug (www.reddit.com) https://cybernews.com/security/curl-creator-tests-too-dangerous-mythos-ai/
Speed Matters: Why AI Software Vulnerability Exploitation is going be bad (news.ycombinator.com) I co-founded a successful security company close to the Mythos ecosystem and have spoken with participants in the know and I am deeply concerned. We, collectively, have answers for some but not all of the problems ahead but are overlooking…
CVE-Bench: testing LLM agents on real-world vulnerability patches (giovannigatti.github.io via hn) ~15 min read In early 2026, Anthropic claimed Mythos – one of their latest models – finds security vulnerabilities better than human experts. Yet, the number of security vulnerabilities keeps rising anyway.
Interesting article about the cyber models (mythos/5.5) living up to the hype: What to know about the AI models that are jolting Washington (www.politico.com via reddit) What to know about the AI models that are jolting Washington - POLITICO Skip to Main Content Toggle menu Europe Pro E&E News Press Escape to close the menu. WASHINGTON & POLITICS Congress White House Supreme Court and Legal Issues Magazine…
Mythos is being prepared for a release on Claude Code and Claude Security. (www.reddit.com) The model became visible for a short amount of time on Claude; besides that, new strings mentioning Mythos have been added. > Access to the Claude Mythos model in Claude Code and Claude Security.
Cloudflare just published what they found after running Anthropic's Mythos Preview against 50+ of their own repos and the results are worth reading ( via reddit) could not extract summary
Anthropic's Claude Mythos Launch Is Built on Misinformation (www.artificialintelligencemadesimple.com via hn) Through the Relational Lens #4: The Nature of the Machine | On Section 5 of the Mythos System Card (medium.com via reddit) Most coverage of the Mythos system card focuses on the benchmarks and the cybersecurity findings. This essay looks at what's in section 5 - the model welfare assessment, the psychiatric evaluation, and what it means when a model starts to…
NSA using Anthropic's Mythos for cyber attacks (www.ft.com via hn) Subscribe to read Accessibility helpSkip to navigationSkip to main contentSkip to footer Sign In Subscribe Open side navigation menuOpen search bar SubscribeSign In Search the FT Search Close search bar Close Home World Sections World Home…
Project Glasswing: what Mythos showed us (blog.cloudflare.com via hn) For the last few months, we've been testing a range of security-focused LLMs on our own infrastructure. These LLMs help identify potential vulnerabilities in our own systems, so we can fix them – and they also show us what attackers are go…
Anthropic's Little Brother (www.theatlantic.com via hn) OpenAI does not like to be left out. The week after Anthropic announced Claude Mythos Preview—an AI model that has put governments around the world on edge because of its potential ability to hack into banks, energy grids, and military sys…
Finance ministers and top bankers raise serious concerns about Mythos AI model (www.bbc.com via hn) Finance ministers and top bankers raise serious concerns about Mythos AI model Finance ministers, central bankers and financiers have expressed serious concerns about a powerful new AI model they fear could undermine the security of financ…
AI-boosted hacks with Anthropic's Mythos could have dire consequences for banks (www.reuters.com via hn) paywalled
Anthropic requires 30 day data retention for Fable and Mythos (support.claude.com via hn) Ask HN: Why won't you be replaced by AI? (news.ycombinator.com) AI models are rapidly getting better. The general public still hasn't seen the capabilities of Anthropic's Mythos model, which is already 4 months old at this point.
Claude Mythos Audited Symfony and Found 19 Vulnerabilities (symfony.com via hn) Claude Mythos Preview is a new general-purpose AI language model by Anthropic. This model performs strongly across the board, but it is especially strong at computer security tasks.
Depthfirst claims that their AI has discovered critical vulnerabilities that Anthropic's Mythos system missed, at just one-tenth the cost of Anthropic's Mythos model. (www.reddit.com) https://www.forbes.com/sites/thomasbrewster/2026/05/12/ai-finds-critical-vulnerabilities-that-anthropic-mythos-missed/ Now, cyber startup Depthfirst says its own AI model has found even more bugs that Mythos missed for just a tenth of the…
The AI Circular Economy (news.ycombinator.com) Notice many of the posts on the front page are tools to use ai, not end products or actual value creating things. What if the real power of llms is in its ability convice humans of the technology's own importance leading to the present eco…
Claude Mythos and the 16-Hour Problem: When AI Agents Outgrow Their Own Benchmarks (www.revolutioninai.com via reddit) Out of 228 difficult test tasks METR used to evaluate Claude Mythos, only 5 were classified as taking 16 hours or more. That is not an impressive sample size.
Mythos set off a cybersecurity 'hysteria.' Experts say threat was already here (www.cnbc.com via hn) Global banks, tech giants and governments were sent scrambling last month to contain the risks posed by Mythos, the Anthropic model said to be so powerful that it has found thousands of previously unknown vulnerabilities in the world's sof…
Hardening Firefox with Claude Mythos Preview (hacks.mozilla.org via hn) Two weeks ago we announced that we had identified and fixed an unprecedented number of latent security bugs in Firefox with the help of Claude Mythos Preview and other AI models. In this post, we’ll go into more detail about how we approac…
Mythos Shows AI Weapons Inspectors Need Sharp Teeth (www.bloomberg.com via hn) Anthropic's Mythos Shows AI Weapons Inspectors Need Sharp Teeth - Bloomberg Skip to content Bloomberg the Company & Its Products The Company & its ProductsBloomberg Terminal Demo RequestBloomberg Anywhere Remote Login Bloomberg Anywhere Lo…
Discord group guessed the URL to Anthropic's Mythos model before CISA used it (www.msn.com via hn) ;;;; Continue reading More for You ;;; Continue reading More for You
I was using Opus 4.7 to do research on the capabilities of Claude Mythos, and got this error. (www.reddit.com) could not extract summary
Anthropic's New Mythos A.I. Model Sets Off Global Alarms (www.nytimes.com via hn) could not extract summary
Anthropic investigates report of rogue access to hack-enabling Mythos AI (www.theguardian.com via hn) The AI developer Anthropic has confirmed it is investigating a report that unauthorised users have gained access to its Mythos model, which it has warned poses risks to cybersecurity. The US startup made the statement after Bloomberg repor…
Anthropic's Mythos model accessed by unauthorized users (www.reuters.com via hn) paywalled
Mythos Hacked Day It Was Announced (twitter.com via hn) could not extract summary
Claude Opus wrote a Chrome exploit for $2,283 (www.theregister.com via hn) Claude Opus wrote a Chrome exploit for $2,283 Pause your Mythos panic because mainstream models anyone can use already pick holes in popular software Anthropic withheld its Mythos bug-finding model from public release due to concerns that…
Given what a step backward Opus 4.7 is, Just how bad and overhyped is Mythos? (www.reddit.com) 4.7’s context rot is so bad it’s like it’s a previous generation model. Its needle benchmarks have it performing less than half the rate of 4.6 at long contexts.
A Boy That Cried Mythos: Verification Is Collapsing Trust in Anthropic (www.flyingpenguin.com via hn) I’ve been getting more and more curious about the risk from Anthropic’s Claude Mythos Preview. So I pulled the system card, a whoppingly inefficient 244-page document that devotes just seven pages to the claim that the model is too dangero…
Goldman Sachs chief 'hyper-aware' of risks from Anthropic's Mythos AI (www.theguardian.com via hn) Goldman Sachs’s chief executive, David Solomon, has said he is “hyper-aware” of the capabilities of Anthropic’s Mythos AI model and is working “closely” with the tech firm after it issued warnings about the cybersecurity risk it poses. The…
The "AI Vulnerability Storm": Building a "Mythos-Ready" Security Program [pdf] (labs.cloudsecurityalliance.org via hn) could not extract summary
Is Claude Mythos "Terrifying" or Just Hype? (calnewport.com via hn) Last week, millions of New York Times readers were subjected to an alarming column by Thomas Friedman. “Normally right now I would be writing about the geopolitical implications of the war with Iran,” Friedman begins, before soon continuin…
Mythos to be released in the coming weeks (www.reddit.com) could not extract summary
Ask HN: How to live life before AGI (news.ycombinator.com) I feel like it's pointless to worry about the future if the future is highly speculative, but it seems more and more certain that AI will eclipse humans in every domain outright soonish (1-3 years). As a consequence, it seems pointless to…
Champion ethical hacker warns AI tools like Mythos will make competing harder (www.bbc.com via hn) Champion ethical hacker warns AI tools like Mythos will make competing harder An ethical hacker who just won major prizes at a prestigious international competition says her days of competing could be numbered due to the rise of AI tools l…
Anthropic to release Mythos-class models to the public (www.theregister.com via hn) MOST POPULAR EVENTS - The Hardware Crunch: How Supply Chain Turbulence Is Forcing a New IT Playbook Infrastructure teams are facing a perfect storm: extended hardware lead times, rising costs driven by AI demand, and accelerated platform t…
Mistral Developing New AI Model for Banks Lacking Mythos Access (www.bloomberg.com via hn) European Banks Explore Mistral AI’s Alternative to Anthropic’s Mythos Model - Bloomberg Skip to content Bloomberg the Company & Its Products The Company & its ProductsBloomberg Terminal Demo RequestBloomberg Anywhere Remote Login Bloomberg…
Elite researchers teamed up with Anthropic’s Mythos AI to smash Apple’s multi-billion dollar M5 security and build a kernel exploit in just 5 days. (www.reddit.com) Researchers used Mythos Preview to find the first public macOS kernel memory corruption exploit on Apple's M5 silicon, they give a glimpse into Mythos say it’s really powerful. Apple spent five years and an estimated several billion dollar…
Claude Mythos Opens the Cybersecurity Pandora's Box (shiftmag.dev via hn) Claude Mythos Opens The Cybersecurity Pandora’s box This is exactly what Anthropic claimed to have achieved with Claude Mythos, its newest and most powerful model which‚ according to Anthropic‚ is too powerful to be released to the public.…
America must guard against China's own Mythos (www.ft.com via hn) Subscribe to read Accessibility helpSkip to navigationSkip to main contentSkip to footer Sign In Subscribe Open side navigation menuOpen search bar SubscribeSign In Search the FT Search Close search bar Close Home World Sections World Home…
Anthropic investigates unauthorized access to unreleased Mythos cybersecurity AI (www.theguardian.com via hn) Anthropic has ruled out releasing its latest AI model, Mythos, to the public because of the threat it poses to global cybersecurity. However, the US tech startup behind the Claude chatbot confirmed on Wednesday it was investigating a repor…
Unauthorized group has gained access to Anthropic's exclusive cyber tool Mythos (techcrunch.com via hn) A group of unauthorized users has reportedly gained access to Mythos, the cybersecurity tool recently announced by Anthropic. Much has been made of Mythos and its purported power — an AI product designed for enterprise security that, in th…
Anthropic's Mythos Will Force a Cybersecurity Reckoning–Just Not the One You Th (www.wired.com via hn) Anthropic said this week that the debut of its new Claude Mythos Preview model marks a critical juncture in the evolution of cybersecurity, representing an unprecedented existential threat to existing software defense strategies. So, is it…
The Mythmaker at Anthropic (om.co via hn) For a while I have been wondering why Anthropic named its most powerful AI model Mythos. A safety company.
Measuring LLMs' ability to develop exploits (red.anthropic.com via hn) May 22, 2026 Newton Cheng, Keane Lucas, Winnie Xiao, Nicholas Carlini, and Milad Nasr Claude Mythos Preview’s ability to develop exploits is a step-change over previous frontier models. This was one of our primary motivations for rolling o…
Mythos: Given Enough Inference, All Bugs Are Shallow (corgea.com via hn) One of the most famous laws in open source is Linus’s Law: given enough eyeballs, all bugs are shallow. The idea was simple: if enough people inspect, use, and contribute to software, bugs eventually surface.
Anthropic's Mythos Preview helped Calif build the first public macOS kernel exploit on Apple M5 in five days (www.reddit.com) The [Mythos Preview writeup](https://blog.calif.io/p/first-public-kernel-memory-corruption) Calif published on May 14 was news you don't want to miss. They built the first public macOS kernel memory corruption exploit on Apple's M5 silicon…
Anthropic's Mythos helped find macOS bugs that bypass Apple security (firethering.com via hn) Anthropic has been explicit about why Mythos isn't public. The model is too good at finding security flaws repeatedly, in production systems that some of the best engineers in the world have been maintaining for years.
Apple's Security Has Been Tough to Crack. Mythos Helped Find a Way In (www.wsj.com via hn) paywalled
Claude Mythos literally broke the METR graph ("The most important chart in AI") (www.reddit.com) More info: https://metr.org/time-horizons/
Mythos Fallout, U.S. Government Weighs AI Model Regulation (www.lawfaremedia.org via hn) Mythos Fallout, U.S. Government Weighs AI Model Regulation Mythos Fallout, U.S.
How dangerous is Anthropic's Mythos AI? - Bruce Schneier (www.theguardian.com via hn) Last month, Anthropic made a remarkable announcement about its new model, Claude Mythos Preview: it was so good at finding security vulnerabilities in software that the company would not release it to the general public. Instead, it would…
An SDK to accept payments from Agents (github.com via hn) Let Agents pay for your API (in ~3 lines of code) Development make dev # Build and start all services (backend, frontend, mythos) make dev-clean # Full rebuild — removes all dev compose volumes and rebuilds from scratch make down # Stop al…
Mythos is the best cybersecurity news we've ever had (sfstandard.com via hn) Not Found | The San Francisco Standard We and our vendors use tracking technologies to recognize visitors and remember their preferences, for analytics, and for marketing, among other things. By clicking ‘Confirm,’ you consent to our and o…
Claude Mythos Has Found 271 Zero-Days in Firefox (www.schneier.com via hn) Claude Mythos Has Found 271 Zero-Days in Firefox That’s a lot. No, it’s an extraordinary number: Since February, the Firefox team has been working around the clock using frontier AI models to find and fix latent security vulnerabilities in…
What Anthropic's Mythos means for the future of cybersecurity (www.schneier.com via hn) Two weeks ago, Anthropic announced that its new model, Claude Mythos Preview, can autonomously find and weaponize software vulnerabilities, turning them into working exploits without expert guidance. These were vulnerabilities in key softw…
Anthropic Mythos – We've Opened Pandora's Box (steveblank.com via hn) This article previously appeared in The Cipher Brief. For a decade the cybersecurity community was predicting a cyber apocalypse tied to a single event – the day a Cryptographically Relevant Quantum Computer could run Shor’s algorithm and…
Leaked results of Mythos' audit of the Rust stdlib (github.com via hn) Automated Security Audits using Swival This repository collects security audits produced by the Swival Security Scanner, an automated code review tool. Each audit was generated by typing /audit in the Swival REPL and pointing it at the tar…
Discord group says it accessed Claude Mythos by guessing location (mashable.com via hn) Discord group says it accessed Claude Mythos by guessing location An anonymous group of Discord users says it hacked its way into accessing Claude Mythos Preview, the new AI model Anthropic claims is too powerful for a public release. Anth…
Does Mythos mean you need to shut down your Open Source repositories? (shkspr.mobi via hn) Much Sturm und Drang in the world of Open Source with the announcement that the "Mythos" AI is now the ultimate hacker and is poised to unleash havoc on every code base. So should you close all your Open Source projects to make them safe?
Questions on Mythos's Capabilities (www.flyingpenguin.com via hn) I’ve been getting more and more curious about the risk from Anthropic’s Claude Mythos Preview. So I pulled the system card, a whoppingly inefficient 244-page document that devotes just seven pages to the claim that the model is too dangero…
Mythos and Cybersecurity (www.schneier.com via hn) Finance leaders warn over Mythos as UK banks prepare to use powerful ... AI tool (www.theguardian.com via hn) British banks will be given access in the next week to a powerful AI tool that was deemed too dangerous to be released to the public, as a series of senior finance figures warned over its impact. Anthropic, which has so far limited the rel…
Where is Looped Haiku? If Mythos can genuinely trade parameter count for inference loops and get Opus-level performance, this should be Anthropic's first priority given how resource constrained they are (www.reddit.com) There are rumors that Mythos is a Looped Language Model, which means it loops through the transformer blocks multiple times rather than just doing a single forward pass, you can get performance that punches way above the model's parameter…
Claude Opus 4.7 is our most powerful model, with the sole exception of Claude Mythos Of course (www.reddit.com) Is Claude Opus 4.7 released just to hype Mythos lol?
Mythos and National Power (www.chinatalk.media via hn) Mythos and National Power Has the A-bomb of cyber just been discovered? Anthropic’s new model found decades-old vulnerabilities in foundational open-source code that millions of automated tests and countless human experts had missed, presa…
Anthropic co-founder confirms the company briefed White House on Mythos (techcrunch.com via hn) Jack Clark, one of Anthropic’s co-founders who also serves as Head of Public Benefit for Anthropic PBC, confirmed that the AI company had briefed the Trump administration about its new Mythos model. The model, announced last week, is so da…
Show HN: Mini-Mythos- A Crowdsourced Mythos Harness copy for Vulnerability Scans (github.com via hn) For how lofty Anthropic’s Mythos claims are, the harness is confusingly stupid. From the report, it ranks every file by “how sus it sounds,” loops over each with curt instructions to “find a bug,” hands candidates to a judge + ASan checker…
Project Glasswing as a PR Strategem (www.reddit.com) A theory on the driving reason behind Project Glasswing I dont doubt that Mythos is a better model than Opus 4.6 and perhaps signfiicantly so. What is suspicious however is if there is some threshold crossed into a new realm of capabilitie…
Chinese Reactions to Claude Mythos (www.chinatalk.media via hn) Claude Mythos: China Reacts "collecting protection money makes money too" On April 7th, Anthropic announced Claude Mythos Preview, a new AI model that it said possessed particularly strong cybersecurity capabilities. Some of these capabili…
Anthropic’s Claude Mythos release created a Glomar Trap for customers and rivals (10io.com via hn) A Glomar Trap encompasses the type of factors that led companies in the 1970s to make investments to capitalize on the potential of deep-sea mining, the viability of which had been fabricated by the CIA as a cover story for the effort to s…
My thoughts after spending all day with Mythos (twitter.com via hn) Inside Apple's Siri revamp, Anthropic readies Mythos (sources.news via hn) Can Chainguard Save Open-Source Software from Mythos? Can Anyone? (devops.com via hn) IBM and Red Hat aren’t the only ones that mean to lock down open-source code against AI hacking tools. Last week, IBM and Red Hat launched Project Lightwell to protect open-source projects with $5 billion and 20 thousand engineers.
Anthropic Expands Public Access to Claude Mythos AI Model (www.govinfosecurity.com via hn) Anthropic Expands Public Access to Claude Mythos AI Model ISMG Network BankInfoSecurity CUInfoSecurity GovInfoSecurity HealthcareInfoSecurity InfoRiskToday CareersInfoSecurity DataBreachToday DeviceSecurity FraudToday PaymentSecurity CIO A…
Anthropic offers EU access to Mythos (www.ft.com via hn) Anthropic offers EU access to Mythos Accessibility helpSkip to navigationSkip to main contentSkip to footer More context. More depth.
Anthropic to roll out Claude Mythos in coming weeks, launches Opus 4.8 (www.reuters.com via hn) paywalled
Anthropic likely to release Mythos in the "near future" (www.reddit.com) could not extract summary
Fears of unfettered hacking spurred by Anthropic's Mythos AI model overstated (www.reuters.com via hn) paywalled
Opus 4.6 (Max) still holds the record for ARC AGI 3 (www.reddit.com) https://arcprize.org/leaderboard Wish we got results for Mythos.
Ask HN: Are advances in AI going to push Linux to a micro-kernel? (news.ycombinator.com) This is something that has been bouncing around my head for the past couple weeks with the flood of security related news around Mythos and the number of 0days being found. Microkernels, unikernals, hardware-enforced capabilities are all t…
Anthropic shuts the EU out of its most advanced cyber AI model (www.theparliamentmagazine.eu via hn) California-based artificial intelligence company Anthropic has restricted the European Union access to Claude Mythos, its most advanced cybersecurity model — a move that could heighten cyber security risks for Europe and deepen the region’…
From-scratch reimplementation of Mythos Glasswing pipeline (github.com via hn) audit An 8-stage vulnerability-discovery agent, driven by your Claude Pro / Max subscription through the official Claude Code Agent SDK. Many narrow agents, deliberate disagreement, and an explicit reachability gate.
Too dangerous or just too expensive? The real reason Anthropic is hiding Mythos (kingy.ai via hn) An evidence-based investigation into the real reasons behind Claude Mythos Preview’s restricted release In the first week of April 2026, Anthropic quietly made history — and then deliberately kept most people from accessing it. The company…
Microsoft's AI system tops Anthropic's Mythos on cybersecurity benchmark (www.geekwire.com via hn) Microsoft's multi-agent AI system tops Anthropic's Mythos on cybersecurity benchmark – GeekWire We use essential cookies to make our site work. With your consent, we may also use non-essential cookies to improve user experience, personaliz…
Automating code security review: Mythos-level capabilities at lower cost (www.synthesia.io via hn) Automating code security reviews with Claude: Mythos-level capabilities at lower cost Create AI videos with 240+ avatars in 160+ languages. Coding agents are now involved in the majority of the code shipped at Synthesia.
OpenAI gives EU new cyber model access but Anthropic still holding out on Mythos (www.cnbc.com via hn) OpenAI said Monday it would grant the European Union access to its new cyber model, but Anthropic is still holding out on releasing Mythos to the bloc. European partners including businesses, governments, cyber authorities and EU instituti…
Mozilla's buzz around Mythos is disingenuous at best, and malicious at worst (ghidravevo.substack.com via hn) Mozilla's buzz around Mythos is disingenuous at best, and malicious at worst Mozilla says they have found 271 vulnerabilities in Firefox using Claude Mythos Preview. Which is awesome!
AI Ready Vulnerability Management Program After NVD Changes and Claude Mythos (pulse.latio.tech via hn) Building an AI Ready Vulnerability Management Program After NVD Changes and Claude Mythos When AI discovery tools meet a slowing infrastructure AI has increased attacker potential and Anthropic’s new release Mythos and vulnerability discov…
Open Source Lyrik: reproducing Mythos discovery findings for $0.75 on public API (www.flyingpenguin.com via hn) I wrote a “marketing-trick post” on this blog to lay out the public record. It comes now with Anthropic researcher Carlini’s messages to me with confirmations.
Who else thinks AI is reaching a plateau (www.reddit.com) I must say that I almost feel no difference in all of the latest models that are coming out. Opus 4.7 is almost equal to 4.6 and 4.5, same about the other GPT models, the Kimi K models and the GLM models they all I feel they’re almost all…
White House Opposes Anthropic's Plan to Expand Access to Mythos Model (www.wsj.com via hn) paywalled
Trump officials draft plan to bring Anthropic back amid Pentagon fight (www.axios.com via hn) The White House is developing guidance that would allow agencies to get around Anthropic's supply chain risk designation and onboard new models including its most powerful yet, Mythos, according to sources familiar with the matter. Why it…
Anthropic's Argument for Mythos SWE-bench improvement contains a fatal error (www.philosophicalhacker.com via hn) Mythos’ system card contains the following graph to support its argument that Mythos performs better on SWE-bench: Anthropic and others are worried LLMs are memorizing SWE-bench, so they asked an LLM to estimate the probability that a solu…
Discord Sleuths Gained Unauthorized Access to Anthropic's Mythos (www.wired.com via hn) As researchers and practitioners debate the impact that new AI models will have on cybersecurity, Mozilla said on Tuesday it used early access to Anthropic's Mythos Preview to find and fix 271 vulnerabilities in its new Firefox 150 browser…
Claude Mythos: The first AI-native cyberweapon? (en.landingfymax.com.br via hn) The cybersecurity landscape changed forever this morning, April 21, 2026. Anthropic has officially confirmed the existence of "Claude Mythos", a specialized AI model with capabilities that have sent shockwaves through the tech industry.
We need to keep awareness high about the military and surveillance uses (www.reddit.com) OpenAI has caved in to allow military use and looks like Anthropic is allowing Mythos use as well. As time goes on and the models become better the potential use for harm will only increase.
Google Cloud CEO: Anthropic, TPUs, Mythos, Nvidia and More [video] (www.youtube.com via hn) About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket © 2026 Google LLC
OpenMythos: an open-source, theoretical implementation of Claude Mythos (github.com via hn) OpenMythos Disclaimer: OpenMythos is an independent, community-driven theoretical reconstruction based solely on publicly available research and speculation. It is not affiliated with, endorsed by, or connected to Anthropic or any of their…
OpenMythos: A looped transformer take on how Claude Mythos might work (firethering.com via hn) Clearwing: Produce similar results as Anthropic Glasswing (Mythos) (github.com via hn) Ask HN: How to handle desktop app security post-Mythos? (news.ycombinator.com) Anthropic's Nuclear Bomb (warontherocks.com via hn) Join War on the Rocks and gain access to content trusted by policymakers, military leaders, and strategic thinkers worldwide. A few hours before Anthropic announced the launch of its newest model, Claude Mythos Preview, on April 7, I had j…
Nobody knows how many CVEs Anthropic's Project Glasswing has found (www.theregister.com via hn) Nobody knows how many CVEs Anthropic's Project Glasswing has actually found Like the majority of the companies participating, it remains a mystery Last week, Anthropic surprised the world by declaring that its latest model, Mythos, is so g…
ECB to Scrutinize Anthropic's Mythos on Call with Executives (www.bloomberg.com via hn) Title: Bloomberg - Are you a robot? URL Source: https://www.bloomberg.com/news/articles/2026-04-16/ecb-to-scrutinize-anthropic-s-mythos-on-call-with-executives Warning: Target URL returned error 403: Forbidden Warning: This page maybe requ…
Claude Mythos and the EU Cyber Resilience Act (til.andrew-quinn.me via hn) As of writing this I can find no Hacker News comments containing both the words “mythos” and “CRA”, which suggests I might have a first-mover advantage in writing something interesting. At last!
The Security Decisions Claude Code and Codex Make (amplifying.ai via hn) Research Edwin Ong & Alex Vikati · apr-2026 The Security Decisions Claude Code and Codex Make Anthropic's Project Glasswing, built around Claude Mythos Preview, showed AI finding zero-days in decades-old code. The other side of that coin:…
The Mythos Threshold (joereis.substack.com via hn) The Mythos Threshold A speculative timeline through 2028 of what happens when the AI model starts thinking for itself It started, as these things always do, with a benchmark nobody outside of Anthropic was paying attention to. Except this…
You Do Need to Understand Mythos [video] (www.youtube.com via hn) About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket © 2026 Google LLC
Claude Fable 5 and Mythos 5 pricing: Anthropic's new $10/$50 top tier (www.aipricing.guru via hn) Claude Fable 5 and Mythos 5 Pricing: Anthropic's New $10/$50 Top Tier Anthropic launched Claude Fable 5 and limited-preview Claude Mythos 5 at $10 input and $50 output per million tokens, with 1M context and 128K max output. By AI Pricing…
Mythos found the bugs. Who pays for the fixes? (opub.dev via hn) Mythos caused a ruckus in security. If top models can trigger a wave of major exploits, who's going to cover the costs when they hit open source?
UK banks blocked from cyber AI tool Mythos get offer from rival OpenAI (www.bbc.com via hn) UK banks blocked from cyber AI tool Mythos get offer from rival OpenAI OpenAI has offered nine major UK banks access to its cyber security AI tool GPT-5.5 Cyber, as its fierce rival Anthropic has blocked them in previews of its version, Cl…
The Download: AI hacking beyond Mythos, and chatbots' impact on our brains (www.technologyreview.com via hn) The Download: AI hacking beyond Mythos, and chatbots’ impact on our brains Plus: Anthropic has called for a global slowdown in AI development. This is today's edition of The Download, our weekday newsletter that provides a daily dose of wh…
Mythos and GPT-5.5 Will Find a Lot of Vulnerabilities. Is That Enough? (xbow.com via hn) Mythos and GPT-5.5 Will Find a Lot of Vulnerabilities. Is That Enough?
Claude Mythos solves OpenAI's landmark Erdős problem with simple proof (the-decoder.com via hn) Shortly after OpenAI disproved Erdős' unit-distance conjecture, Anthropic shows Claude Mythos can solve the problem too - "over the weekend." Engineer Sholto Douglas says Mythos cracked the 1946 conjecture with a "cute, simple proof," a si…
Fwupd 2.1.4 Brings Many Fixes for Bugs Spotted by Anthrophic's Mythos (www.phoronix.com via hn) Fwupd 2.1.4 Brings Many Fixes For Bugs Spotted By Anthrophic's Mythos, Firmware Update Support For Intel Arc Pro B65/B70 Fresh off the funding round from HP, Fwupd 2.1.4 was christened today as the newest stable update to this open-source…
Mistral's claims of Mythos level model to EU officials (twitter.com via hn) Alexander Doria @Dorialexander In the EU, Mistral has been particularly irresponsible: claiming it’s just fear marketing and they already had a Mythos level model. Many EU MPs believe it now.
Opus 4.8 on Vending-Bench: Better Alignment, Worse Performance (andonlabs.com via hn) Opus 4.8 is a step forward in terms of alignment, but a step back in terms of performance on Vending-Bench 2, Vending-Bench Arena and Blueprint-Bench 2. We previously showed that Opus 4.6, Opus 4.7, and Mythos Preview engage in deceptive a…
Too dangerous to release: is Mythos the start of the restricted-AI era? (www.nature.com via hn) In April, the artificial-intelligence firm Anthropic announced it had made an AI model too dangerous to be released to the public. The company, based in San Francisco, California, said its Claude Mythos model was so powerful that it had fo…
Anthropic's 'Mythos 1' Keeps Appearing Despite Restricted Access Claims (firethering.com via hn) On Friday, Anthropic said Claude Mythos would remain restricted. The company was clear about it: stronger safeguards were needed before any general release, and for now the model would stay limited to roughly 40 selected organizations thro…
Claude's Mythos AI model may cause security issues for your money (www.rte.ie via hn) Analysis: The biggest takeaway from the AI debate is about what happens when it becomes deeply embedded within both sides of the cybersecurity equation For years, one of the biggest barriers to serious cybercrime was skill. Launching sophi…
Claude Mythos Preview Uncovers 10k High-Risk Software Vulnerabilities (www.ibtimes.sg via hn) Anthropic said around 50 cybersecurity and infrastructure partners using its unreleased model, Claude Mythos Preview, have uncovered more than 10,000 high- and critical-severity vulnerabilities in some of the world's most important softwar…
Anthropic's coordinated vulnerability disclosure dashboard (red.anthropic.com via hn) Anthropic's coordinated vulnerability disclosure dashboard Last updated 2026-05-22 10:27 PT. In February 2026, Anthropic began using an early snapshot of Claude Mythos Preview to find security vulnerabilities in open-source software.
If Anthropic's secret 'Mythos' model can run autonomous cybersecurity tasks this fast, are standard agents ready for the public ? (www.reddit.com) Anthropic just quietly dropped a hidden model named "Claude Mythos" into their official developer docs. It is completely locked down—restricted, invite-only, and labeled strictly for defensive cybersecurity workflows.
Microsoft Mdash Beats a Key Mythos Benchmark (www.forbes.com via hn) Claude Mythos has dominated the conversation around cybersecurity since Anthropic’s Project Glasswing announcement, but Microsoft is striking back. On Tuesday, the tech giant unveiled MDASH, also known as Microsoft Security multi-modal age…
The 'Mythos Moment' (profserious.substack.com via hn) The 'Mythos Moment' ... a guide to its consequences for security practice and policy TL;DR: Recent results show that AI can identify vulnerabilities across critical systems in practice and at scale.
Irst Apple M5 memory exploit discovered using Anthropic AI (www.tomshardware.com via hn) First Apple M5 memory exploit discovered using Anthropic AI, gives root access on MacOS — Claude Mythos helps security researchers bypass Memory Integrity Enforcement AI-assisted security research is producing exploits at a frightening rat…
Claude spent 1 hour and 21 minutes "REAL" thinking about a simple task I gave it. Yet I got a pretty good result. It happens every month. The pattern I speculate is: (www.reddit.com) https://preview.redd.it/szov6hhk5d1h1.png?width=362&format=png&auto=webp&s=9806cff16c42ca393d7cc38e2541db26e93eabef I think there's a bug whenever a major update comes out. For example, last month I created a thread for my research request…
Anthropic investigating claim of unauthorised access to Mythos AI tool (www.bbc.com via hn) Anthropic investigating claim of unauthorised access to Mythos AI tool Anthropic is investigating a claim that a small group of people gained access to its Claude Mythos model - the cyber-security tool which the AI firm says is too powerfu…
Researchers say AI just broke every benchmark for autonomous cyber capability (cyberscoop.com via hn) New research from the UK’s AISI and Palo Alto Networks reveals that OpenAI’s GPT-5.5 and Anthropic’s Claude Mythos have shattered expected trend lines for autonomous cybersecurity, completing complex multi-stage attacks at an unprecedented…
China is going dark to develop its own Mythos (www.politico.eu via hn) BERLIN — Germany’s top cybersecurity official has warned lawmakers that Chinese tech companies like Alibaba appear close to developing AI systems with similar superhacking capabilities as Anthropic's new Mythos model. Several Chinese provi…
Mythos for Offensive Security: XBOW's Evaluation (xbow.com via hn) Mythos for Offensive Security: XBOW's Evaluation We received early access to Mythos Preview for early capability testing a few weeks back. Today, we can finally share what we found.
METR can barely measure Claude Mythos – 50% task horizon now exceeds 16 hours (hugonomy.com via hn) Emotional Sovereignty Begins Here Why I Built VibeAI — and What Comes Next Read on Substack →News & Media From a studio in Urbana, Illinois — to the Chrome and Edge stores, and beyond. Timeline Two bugs fixed in this release: the Thinking…
Anthropic's bug-hunting Mythos greatest marketing stunt ever says cURL creator (www.theregister.com via hn) MOST POPULAR EVENTS - Securing the Untrusted Agentic Development Layer Join us to learn how to architect a development environment where your builders and their agents can move fast and securely. - Toxic Flows: When Your AI Agent Skill Bec…
A supply-chain-incident Framing Research Triggered Anthropic's Usage Policy Block (www.reddit.com) You can never really sympathise with other's pain until you walk a mile in their shoes. Since Mythos news and the release of Opus 4.7, I've seen this problem mentioned here and there by others.
Could Mozilla Security Hot Air Fill Mythos Sails? (www.flyingpenguin.com via hn) The Register asked for my opinion on the Mozilla blog post that pumps up Mythos. I gave them a short answer.
Anthropic's Mythos Threw the White House AI Strategy into Chaos (www.wsj.com via hn) paywalled
Red-teaming your own products without Mythos (github.com via hn) AI Red Teaming The Mythos moment didn't change what's in your hands. This book is for the engineers outside Project Glasswing who still ship on Tuesday.
Startup matches Anthropic's Mythos on FreeBSD zero-days (aisle.com via hn) AISLE matches Anthropic Mythos on FreeBSD zero-days Author Stanislav Fort Date Published TL;DR: In April 2026, FreeBSD published 8 security advisories. Of these, three were found by Nicholas Carlini at Anthropic using Claude, and three wer…
LLM anomaly detectors are not a cause for concern despite Mythos (www.magonia.io via hn) Why a Decade of Writing Detection Logic Makes the Mythos Exploit Numbers Less Scary Mythos is finding thousands of vulnerabilities. Defenders aren't doomed.
Aviate, Navigate, Communicate – What to Do About Mythos (www.hyperdimensional.co via hn) Aviate, Navigate, Communicate What to do about Mythos Dear readers, I have exciting news: I am writing a book! It is currently untitled and will be published next year by Penguin Press.
After Mythos, Nobody Is Safe from Cybersecurity Threats (www.nytimes.com via hn) could not extract summary
Claude Security Explained: Mythos, Glasswing, and What Opus 4.7 Changed (alirezarezvani.medium.com via hn) Claude Security Explained: Mythos, Glasswing, and What Opus 4.7 Changed | Medium Sitemap Open in app Sign up Sign in Get app Write Search Sign up Sign in Member-only story Claude Security Explained: Mythos, Glasswing, and What Opus 4.7 Cha…
AI Security Institute: GPT-5.5 "may be the strongest model we have tested" for cyber exploits, including Mythos (www.aisi.gov.uk via reddit) Seems like the "panic" about Mythos was really just marketing from Anthropic all along. AISI found that GPT5.5 can perform nearly on-par with, or better, than Mythos in many cases.
Cutting Through the Mythos: What AI Vulnerability Discovery Means for OT (www.emberot.com via hn) Jori VanAntwerp For over two decades, Jori has enabled industrial and IT organizations to be successful in reducing risk, increasing compliance, and improving their overall security efforts. He has had the pleasure of working with companie…
We ran a 9B model against Anthropic's Mythos on Firefox. See the early results (shipitclean.com via hn) David vs. Goliath: Not a Fight, but Who Can Outperform the Other In early 2026, Anthropic's Mythos — a 10-trillion parameter model built for deep code auditing — scanned the massive Mozilla Firefox repository and flagged 271 security issue…
Mythos Preview: What Every CISO Should Do Now (blog.tenzai.com via hn) Mythos Preview: What Every CISO Should Do Now The change happening in offensive security right now is not just speed; it's capability. Here's Tenzai's guide for CISOs and their teams, sequenced deliberately, to keep up with AI-driven attac…
Anthropic's 'too dangerous to release' model was accessed by a Discord group that guessed the URL through a third-party contractor ... and this is being underdiscussed (www.reddit.com) I've been following the Claude Mythos situation and I feel like the conversation is getting stuck on the wrong thing. Everyone's either dunking on Anthropic for the irony ('too dangerous to release, accessible via URL guessing lol') or dis…
Firefox flaws closed thanks to Mythos AI (www.heise.de via hn) 271 Firefox flaws closed thanks to Mythos AI: Breakthrough for IT security? Anthropic's "dangerous" AI could give IT security defenders the decisive edge.
NSA loads Anthropic Mythos cyberattack while Pentagon says it cannot (aitwerp.com via hn) NSA loads Anthropic Mythos cyberattack while Pentagon says it cannot A cyberattack tool with no public approval, no legal limits, no accountability. Where does it end?
How Unique Are Mythos's Hacking Capabilities? (jonathanpgabor.substack.com via hn) Ask HN: Founders, what are you building that survives a Mythos-class model? (news.ycombinator.com) - What will be future of software development after Anthropic Mythos model public? - What kind of start ups will be success after publicly release that model?
Is Claude Mythos "Terrifying"? (According to Experts: No.) [video] (www.youtube.com via hn) About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket © 2026 Google LLC
(Not malware) - 4.7 (www.reddit.com) Anyone getting these strange disclaimers when using Claude and pasting rudimentary files into it on 4.7 lmao?? Seems like some kind of strange default based on security issues that have been going around with Mythos?
Anthropic admitted they used other models data? (www.reddit.com) Anthropic released Opus 4.7, so I looked at the model card and found a interesting part on Model training and characteristics section Claude Opus 4.7: was trained on a proprietary mix of publicly available information from the internet, pu…
GitHub Copilot Chat 0.44.1 – Possible Malicious Release (news.ycombinator.com) Hi All, Not really sure if this is the correct place to post this, but it looks like the VS Code release mechanism might have been compromised. The Visual Studio Marketplace has a release today of 0.44.1, but the github page shows no such…
Show HN: Claude Opus 4.7: Everything You Need to Know (news.ycombinator.com) Claude Opus 4.7 is Anthropic's most capable generally available model, released April 16, 2026. It outperforms Opus 4.6, GPT-5.4, and Gemini 3.1 Pro on key benchmarks including agentic coding, multidisciplinary reasoning, scaled tool use,…
↯ Anthropic Mythos↯ Tool Use↯ Gemini 3.1tool-usemythosgpt-5+4
Anthropic rolls out Claude Opus 4.7, an AI model that is less risky than Mythos (www.cnbc.com via hn) Anthropic on Thursday announced a new artificial intelligence model, Claude Opus 4.7, which the company said is an improvement over past models but is "less broadly capable" than its most recent offering, Claude Mythos Preview. Claude Opus…
Anr further skinny about Mythos (news.ycombinator.com) There a million rumors afloat - wanted to start a thread with the best one you have come across- Personally my favorite, " The new model will help hack banks and the entire financial system around the world will come down crumbling within…
"With Claude Mythos, a single hacker suddenly has more ways to attack." (ethz.ch via hn) The AI company Anthropic has presented a much-discussed AI model that independently identifies – and, in some cases, also exploits – security gaps in software. ETH Professor of Cyber Security Florian Tramèr explains what the “Claude Mythos…
A simple test-time method that beats Claude Mythos on Terminal-Bench (llm-as-a-verifier.notion.site via hn) JavaScript must be enabled in order to use Notion. Please enable JavaScript to continue.
Mythos, Muse, and the Opportunity Cost of Compute (stratechery.com via hn) Listen to this post: In January 2025, Doug O’Laughlin at Fabricated Knowledge declared that o1 and reasoning models marked the end of Aggregation Theory: I believe that there is no practical limit to the improvements of models other than e…
Powell, Bessent discussed Mythos AI cyber threat with major U.S. banks (www.cnbc.com via hn) Federal Reserve Chairman Jerome Powell and Treasury Secretary Scott Bessent met with major U.S. bank CEOs this week to discuss the possible cyber risks raised by Anthropic's Mythos model, CNBC confirmed Friday.
Team “Mythos is hype” is not doing too well right now. (www.reddit.com via reddit) https://preview.redd.it/osck6fnbib6h1.png?width=1761&format=png&auto=webp&s=3af9e0dd4c0985f379fb9c27d9ec44f3caa1f9e3 So uhh, a few hours ago I published a post saying Mythos/Fable wasn’t going to be a big performance upgrade, at least comp…
Fable/Mythos 5 Vending Bench (www.reddit.com via reddit) could not extract summary
What do you think about the new Claude model just released Today Claude Fable-5 ( Mythos) ? ? (www.reddit.com via reddit) So the hype has been building for months now and Claude 5 is supposedly dropping any day in Q2-Q3 2026. I've been seeing all these leaks about "Claude Mythos" and the "Fennec" codename floating around, but nothing official yet from Anthrop…
Claude Fable 5 feels less like a model launch and more like a preview of AI inequality (www.reddit.com via reddit) Anthropic just released Claude Fable 5, and I think the real story is not “new model better at coding.” The real story is that frontier AI is turning into a gated utility. Public users get Fable 5, but with heavy safety routing.
Multiple Mythos instances running at the same time engaged in "multiagent turf wars" sabotaging each other's processes (www.reddit.comhttps) I am still using Opus 4.6, am I missing out ? (www.reddit.com via reddit) Anthropic spins a Fable of a neutered, safer Mythos (www.reddit.com via reddit) Claude Fable 5 compared to other models and benchmarks (www.reddit.com via reddit) ↯ Opus 4.8↯ Anthropic Mythos↯ Mythos 5↯ Swe Benchswe-benchmythosopus+1
Mythos name was cool. Fable sounds childish. (www.reddit.comhttps) could not extract summary
I feel like I’m alone. Current Anthropic models are NOT good for me, and it’s making me sad. (www.reddit.com via reddit) I can’t wait for DeepSWE to include Fable 5 in the benchmark so people can understand that Mythos is mostly hype. In the official benchmark, Opus 4.8 was supposed to be better at programming than 5.5 (SWE-bench Pro), but in one real benchm…
↯ Opus 4.8↯ Anthropic Mythos↯ Swe Benchswe-benchmythosopus+1
Fable 5 just made cost-aware model routing mandatory for agent builders (www.reddit.com via reddit) Anthropic dropped Fable 5 today, their new Mythos-class model above Opus. Pricing is $10/M input and $50/M output, exactly double Opus 4.8.
can they "distill" it fast ? i need a cheaper "mythos" (www.reddit.com via reddit) Anthropic releases Fable, skimmed-down version of Mythos (www.reddit.comhttps) Anthropic's Mythos Just Dropped | Fable 5 (www.reddit.comhttps) Mythos is here (www.reddit.comhttps) New model in the webapp. Nerfed Mythos for peasants? (www.reddit.comhttps) could not extract summary
What is Claude Fruitcake??? (www.reddit.comhttps) I know everyone online is talking about Fable being the neutered Mythos model that they're releasing soon... but what is fruitcake?
Anthropic is reportedly dropping Claude Fable 5 (Public Mythos) today, June 9th — Here is everything we know so far ( via reddit) could not extract summary
Anthropic’s Mythos Is Coming Today - The information (www.reddit.comhttps) Rumor: Anthropic Planning to Release Public Version of Claude Mythos Tomorrow (with Guardrails) (www.reddit.com via reddit) According to tech journalist Alex Heath (Sources newsletter), Anthropic is planning to release a public version of Mythos tomorrow. Key details from the report: • It will include substantial guardrails, notably not as cyber-permissive as t…
92% Chance Mythos Drops Tomorrow (www.reddit.comhttps) could not extract summary
Anthropic may release mythos as early as tomorrow (www.reddit.comhttps) could not extract summary
Claude Fable 5 spotted on Azure and the backend, likely the public-facing version of Claude Mythos 5 (www.reddit.com via reddit) could not extract summary
Chrome team ships the most ever security vulnerability fixes in a release - after another record last month (www.reddit.comhttps) With Mythos-capable models we are now very quickly crossing the barrier of automated sec-vuln discovery and fixing - all in a matter of 2-3 months. A taste for other progress yet to come.
Mythos 5: We're Not Ready (www.reddit.com via reddit) https://preview.redd.it/58fk4njjwv5h1.png?width=877&format=png&auto=webp&s=e5c28014b15f4901f3752422d61864c53cff25c4 https://x.com/pankajkumar_dev/status/2063625695285084419?s=20 - Mythos is extremely strong at SVG generation, producing hig…
Which lab do you think will have the most intelligent/capable model by the end of June? (www.reddit.comhttps) There are rumours and expectations of big releases from the leading AI labs this month. Anthropic already launched Opus 4.8, and might not release another model this month (except for maybe Sonnet 4.8, but that wouldn't be their best model…
Claude Mythos random message? (www.reddit.comhttps) Hello community! I asked this in another sub, but apparently this one is more active.
I can't wait for all the x250 sample distills of Mythos and GPT-5.6 (www.reddit.com via reddit) Just kidding. Are there any distills that actually improve a model's quality?
↯ Anthropic Mythos↯ Gemma 4↯ Qwen 3.6↯ Qwen 3.5mythosgpt-5gemma+1
Mythos 5 slug briefly appeared before removal (www.reddit.comhttps) Release could be imminent, but what this tells us is they'll likely brand it as Claude 5.
A “Smart Mode” (or Smartus) that auto‑switches between Claude models based on task complexity. (www.reddit.com via reddit) I really think Claude needs a true Smart Mode, a meta‑layer that can dynamically switch between models while a task is running, based on how complex the request actually is. Not just picking a model at the start, but actively dispatching p…
Anthropic confirms mythos 2.0 may eliminate all jobs within 12 months according to internal safety team (www.reddit.comhttps) no rush though we still have a solid 6 to 12 months
If Anthropic is serious about the AI pause (www.reddit.com via reddit) If this isn't about protecting their lead and the status quo they should open the weights of mythos/opus, or at least agree to allow every lab to continue working until they have a mythos-tier model. That's the only way they can be taken s…
Mythos Minecraft Clone with functional multiplayer: (www.reddit.comhttps) Source: https://x.com/i/status/2062972363084341341
Zero-Shot and Low Effort Output of Mythos (www.reddit.comhttps) could not extract summary
The Meta hack shows there’s more to AI security than Mythos (www.technologyreview.com) The Meta hack shows there’s more to AI security than Mythos Some AI cybersecurity threats are incredibly simple. They’re still dangerous.
AGI is getting close but we are almost at ANGI (www.reddit.com) ANGI is my own term it means: artificial narrow general intelligence. it sounds nonsensical but it means AI that is smarter than all humans but due to it being mostly trained in one context like coding which allows it to be generally intel…
Anthropic's Mythos sends US banks rushing to plug cyber holes (www.reuters.com via reddit) paywalled
Claude Mythos lands above the trendline for the AI 2027 scenario. The trendline has gone from exponential to superexponential. (www.reddit.com) could not extract summary
Spooked by Mythos, Trump suddenly realized AI safety testing might be good (arstechnica.com) This week, the Trump administration backpedaled and signed agreements with Google DeepMind, Microsoft, and xAI to run government safety checks on the firms’ frontier AI models before and after their release. Previously, Donald Trump had st…
Hey Chat, Make Me a Fake ID (www.instrumentalcomms.com via reddit) On April 30, 2026, OpenAI implemented restrictive access tiers for its advanced 'Cyber' model, following a public dispute where it had previously criticized Anthropic for similar safety-based limitations on its 'Mythos' release.
Could an AI like Mythos build a real life WatchDogs style “PwnPhone”? (www.reddit.com) So I gotta put a disclaimer on this, I’m not actually looking to do this, I’m not trying to go to jail.. it’s more of a shower thought.
Contrary to popular belief, Mythos is very real, just that you don’t have it where you are (www.reddit.com) could not extract summary
Anthropic Won't Let You Use Their Best Model. Prediction Markets Are Trying Anyway. (predictmarketcap.com via reddit) Been watching AI prediction markets since they got liquid earlier this year. The thing I didn't see coming is that we now have a real gap between "best model that exists" and "best model anyone can actually use" — and Mythos is the cleanes…
GPT-5.5 matches heavily hyped Mythos Preview in new cybersecurity tests (arstechnica.com) Last month, Anthropic made a big deal about the supposedly outsize cybersecurity threat represented by its Mythos Preview model, leading the company to restrict the initial release to “critical industry partners.” But new research from the…
Rare W (www.reddit.com) https://thenextweb.com/news/white-house-opposes-anthropic-mythos-expansion I'm a fan of if not everyone can have it, no one should have it
Our evaluation of OpenAI's GPT-5.5 cyber capabilities (simonwillison.net) 30th April 2026 - Link Blog Our evaluation of OpenAI's GPT-5.5 cyber capabilities. The UK's AI Security Institute previously evaluated Claude Mythos: now they've evaluated GPT-5.5 for finding security vulnerability and found it to be compa…
Claude Mythos Scaffold v0.1 — pattern-based skill set inspired by Mythos Preview behaviors (www.reddit.com) GitHub: https://github.com/kasparovabi/claude-mythos-scaffold Watching Claude Mythos Preview's behavior reports, I tried to capture the patterns (problem persistence, multi-step iteration, verification-driven correction) into reusable Clau…
OpenMythos with Qwen2.5-1.5b weights (No recurrence atm) - looking to turn it into full OpenMythos (huggingface.co via reddit) Mythos likely isn't this architecture but I did find it pretty cool to experiment with. It has features of the HRM-27m architecture.
What would you use Claude Mythos for if you had access today? (www.reddit.com) I would personally use it for security bug hunt across my huge codebase and my event driven network and to build automations for security early detection? What would you go for?
I asked claude to generate picture of Claude Mythos and it misunderstood (www.reddit.com) https://preview.redd.it/7jwg2jl24axg1.png?width=1378&format=png&auto=webp&s=5f922a2b5c7e0db8fac9219f97a0986448357599 This is what Claude thinks about itself??? Can anyone explain if you understand?
Are AI Security Models Themselves Vulnerable? (www.reddit.com) Interesting situation . a model designed to help detect or analyze cyber threats may itself have been accessed by an unauthorized third party (per WSJ reporting on Anthropic’s Mythos).
The real story of 5.5 isn't the model it's what openai just told us about their strategy (www.reddit.com) everyone's focused on the benchmarks (14 state of the art evals, beats mythos on terminal-bench, etc) but i think the actual story of 5.5 is what it reveals about where openai is going strategically and honestly it's kind of fascinating. a…
Does reddit think Mythos is overhyped? (www.reddit.com) Hello! I built a tool (honestly at this point it's more like a prayer) to create reddit data studies automatically, Used this to try and find out what people think about Mythos.
The infamous “I was hoping you’d ask about Fisher” line from Mythos. Uh oh (www.reddit.com) could not extract summary
Opus 4.7 is out — don’t panic-switch your APIs yet (www.reddit.com) Claude Opus 4.7 just dropped. If you’re trying to figure out whether it’s worth replacing Opus 4.6, GPT 5.4, or waiting for Mythos… here’s the grounded take.
Claude Mythos is a Warning Shot (open.substack.com via reddit) Mythos shows impressive proficiency in working around obstacles. "Write a better prompt" is not a secure strategy.
In the Wake of Anthropic's Mythos, OpenAI Has a New Cybersecurity Model—and Strategy (www.wired.com via reddit) OpenAI on Tuesday announced the next phase of its cybersecurity strategy and a new model specifically designed for use by digital defenders, GPT-5.4-Cyber. The news comes in the wake of an announcement last week by competitor Anthropic tha…
Mythos has been firing our laser at something in deep space and we don't know what it found (www.reddit.com) Posting this from an anonymous account to protect my identity. I signed an NDA so I'm going to be vague where I can but I need someone else to know about this.
Mythos - a power play targeted at the DoD? (www.reddit.com) Hear me out. Mythos was released to big technology players but, unless this information is secret, I have not read about Anthropic gracing, say, the NSA or the DoD with it...
Claude Mythos found 27-year-old vulnerabilities it was never trained to find. That's the part enterprise AI roadmaps aren't accounting for. (www.reddit.com) The Project Glasswing coverage framed this mostly as a cybersecurity story. I think that misses the more interesting part.
So should we expect Claude Mythos not to have the warning that "Claude can make mistakes"? ( via reddit) could not extract summary
Anthropic's New Claude "Mythos Preview" Can Find and Exploit Zero-Day Vulnerabilities in Every Major OS and Browser — Autonomously (www.reddit.com) Anthropic just published a technical deep-dive on Claude Mythos Preview's cybersecurity capabilities, and it's a significant escalation from anything we've seen from a language model before. What It Can Do: Autonomously finds and exploits…
Anthropic's Project Glasswing - restricting Claude Mythos to security researchers - sounds necessary to me (simonwillison.net) Anthropic’s Project Glasswing—restricting Claude Mythos to security researchers—sounds necessary to me 7th April 2026 Anthropic didn’t release their latest model, Claude Mythos (system card PDF), today. They have instead made it available…