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Anthropic Mythos

295 items · started 2026-04-07 · ongoing (last activity 2026-06-09)

  1. 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…

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  3. 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.

  8. 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…

  9. 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?

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  11. 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…

  12. 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.

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  20. I know everyone online is talking about Fable being the neutered Mythos model that they're releasing soon... but what is fruitcake?

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  25. 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…

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  28. 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.

  29. 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.

  30. For a while I have been wondering why Anthropic named its most powerful AI model Mythos. A safety company.

  31. 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…

  32. 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…

  33. Hello community! I asked this in another sub, but apparently this one is more active.

  34. Just kidding. Are there any distills that actually improve a model's quality?

  35. Release could be imminent, but what this tells us is they'll likely brand it as Claude 5.

  36. 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…

  37. 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…

  38. no rush though we still have a solid 6 to 12 months

  39. 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…

  40. Source: https://x.com/i/status/2062972363084341341

  41. 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…

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  43. The Meta hack shows there’s more to AI security than Mythos Some AI cybersecurity threats are incredibly simple. They’re still dangerous.

  44. 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…

  45. 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.

  46. 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…

  47. Mythos and GPT-5.5 Will Find a Lot of Vulnerabilities. Is That Enough?

  48. Anthropic Expands Public Access to Claude Mythos AI Model ISMG Network BankInfoSecurity CUInfoSecurity GovInfoSecurity HealthcareInfoSecurity InfoRiskToday CareersInfoSecurity DataBreachToday DeviceSecurity FraudToday PaymentSecurity CIO A…

  49. 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…

  50. 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…

  51. ~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.

  52. 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.

  53. 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…

  54. paywalled

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  56. 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?

  57. 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…

  58. 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…

  59. 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…

  60. 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…

  61. https://x.com/i/status/2059298565093196012

  62. 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…

  63. 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…

  64. 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…

  65. 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…

  66. 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…

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  68. 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…

  69. 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…

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  71. 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.

  72. 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…

  73. 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.

  74. paywalled

  75. https://arcprize.org/leaderboard Wish we got results for Mythos.

  76. 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…

  77. P.S. I hope there's at least someone here who has access to Mythos...

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  79. 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.

  80. 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’…

  81. 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.

  82. 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.

  83. 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…

  84. 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…

  85. 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…

  86. 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.

  87. 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…

  88. 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…

  89. 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.

  90. 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…

  91. 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…

  92. 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…

  93. https://x.com/i/status/2055314585058693601

  94. 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…

  95. 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…

  96. src https://www.wsj.com/tech/ai/anthropic-mythos-apple-macos-bug-339da403

  97. https://cybernews.com/security/curl-creator-tests-too-dangerous-mythos-ai/

  98. paywalled

  99. 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…

  100. 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.

  101. 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…

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  103. 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…

  104. 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.

  105. 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…

  106. paywalled

  107. 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.

  108. 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…

  109. 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…

  110. 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.…

  111. 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…

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  113. TLDR: The market's 1T valuation is pricing for perfection. I think there are 4 ways this perfection doesn't happen.

  114. 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…

  115. 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.

  116. 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.

  117. More info: https://metr.org/time-horizons/

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  119. src - https://hacks.mozilla.org/2026/05/behind-the-scenes-hardening-firefox/

  120. 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…

  121. The Register asked for my opinion on the Mozilla blog post that pumps up Mythos. I gave them a short answer.

  122. 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…

  123. Mythos Fallout, U.S. Government Weighs AI Model Regulation Mythos Fallout, U.S.

  124. 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…

  125. 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…

  126. 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!

  127. paywalled

  128. Source: Behind the Scenes Hardening Firefox with Claude Mythos Preview - Mozilla Hacks

  129. 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…

  130. 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…

  131. 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…

  132. 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…

  133. ;;;; Continue reading More for You ;;; Continue reading More for You

  134. 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…

  135. 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.

  136. 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…

  137. 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…

  138. 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…

  139. 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.

  140. Why a Decade of Writing Detection Logic Makes the Mythos Exploit Numbers Less Scary Mythos is finding thousands of vulnerabilities. Defenders aren't doomed.

  141. 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.

  142. 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.

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  144. 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.

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  147. 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…

  148. 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…

  149. 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…

  150. 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…

  151. 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…

  152. 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

  153. 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…

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  155. 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…

  156. 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.

  157. 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…

  158. 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.

  159. paywalled

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  161. 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…

  162. 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…

  163. 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…

  164. 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…

  165. 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…

  166. 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…

  167. 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…

  168. 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…

  169. 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…

  170. 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…

  171. 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…

  172. 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…

  173. Mythos likely isn't this architecture but I did find it pretty cool to experiment with. It has features of the HRM-27m architecture.

  174. 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?

  175. 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…

  176. 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.

  177. 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.

  178. 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…

  179. 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?

  180. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket © 2026 Google LLC

  181. https://www.anthropic.com/transparency

  182. 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).

  183. 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?

  184. 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…

  185. 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…

  186. 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.

  187. 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…

  188. 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…

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  190. 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.

  191. could not extract summary

  192. 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…

  193. 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…

  194. 271 Firefox flaws closed thanks to Mythos AI: Breakthrough for IT security? Anthropic's "dangerous" AI could give IT security defenders the decisive edge.

  195. 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…

  196. 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…

  197. 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…

  198. New models are around the corner. GPT 5.5 is being tested.

  199. paywalled

  200. 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…

  201. could not extract summary

  202. 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…

  203. 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?

  213. - 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?

  214. 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…

  215. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket © 2026 Google LLC

  216. could not extract summary

  217. 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…

  218. 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…

  219. 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…

  220. 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?

  221. 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…

  222. could not extract summary

  223. 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.

  224. 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…

  225. could not extract summary

  226. 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…

  227. Is Claude Opus 4.7 released just to hype Mythos lol?

  228. 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,…

  229. 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…

  230. 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…

  231. 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.

  232. 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…

  233. could not extract summary

  234. 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.

  235. 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…

  236. 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…

  237. 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!

  238. 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…

  239. 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…

  240. 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…

  241. 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…

  242. 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:…

  243. 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…

  244. 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…

  245. Source: www.aisi.gov.uk/blog/our-evaluation-of-claude-mythos-previews-cyber-capabilities

  246. Mythos shows impressive proficiency in working around obstacles. "Write a better prompt" is not a secure strategy.

  247. 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…

  248. 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…

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  250. 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…

  251. 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?

  252. 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…

  253. 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…

  254. 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?

  255. 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.

  256. 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...

  257. The Project Glasswing coverage framed this mostly as a cybersecurity story. I think that misses the more interesting part.

  258. 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…

  259. could not extract summary

  260. paywalled

  261. could not extract summary

  262. 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…

  263. 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.

  264. 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…

  265. Full link: https://www.aisi.gov.uk/blog/our-evaluation-of-claude-mythos-previews-cyber-capabilities

  266. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket © 2026 Google LLC

  267. 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…

  268. 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.

  269. 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…

  270. 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…

  271. 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…

  272. 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.

  273. could not extract summary

  274. 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…

  275. 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…

  276. 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…

  277. 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.

  278. 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?

  279. 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.

  280. could not extract summary

  281. looks like the internal model is really powerful. metr time horizon should be definitely multiple days, see 93% is outstanding.

  282. Link: https://red.anthropic.com/2026/mythos-preview/

  283. 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…

  284. could not extract summary

  285. Covers Claude 3 Opus, 3.5 Sonnet, Opus 4, 4.1, 4.5, 4.6, and the just announced Mythos Preview.

  286. could not extract summary

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