- August 21, 2026 - 5min We're sharing an update on our efforts to help more teams use frontier capabilities for cyber defense. Claude Mythos 5 is now available in Claude Security, and coming soon to partners' cyber defense tools.
model
Qwythos-9B-Claude-Mythos-5-1M-GGUF
huggingface.co/empero-ai/Qwythos-9B-Claude-Mythos-5-1M-GGUF ↗
486810 downloads587 likestext-generationgguf
from the model card
🚨 v2 released — please redownload the GGUFs The v2 GGUFs replace the original normal filenames and add explicit -MTP- variants. If you downloaded this repo before v2, please redownload your GGUF. Fixes in v2: tokenizer metadata normalized for Qwen3.5 GGUF runtimes; embedded chat template updated for reliable tool/function calling and OpenCode-style agent loops; Qwythos/Empero identity prompt embedded in the template; MTP-enabled variants added as Qwythos-9B-Claude-Mythos-5-1M-MTP-*.gguf; Q4/Q8 tool-calling, MTP draft speculation, 1M-context allocation, and vision projector smoke-tested with current llama.cpp. Use the normal files for maximum runtime compatibility. Use the -MTP- files when you want llama.cpp MTP draft speculation. Qwythos-9B-Claude-Mythos-5-1M-GGUF Developed by Empero GGUF quantizations of empero-ai/Qwythos-9B-Claude-Mythos-5-1M for llama.cpp, Ollama, LM Studio, jan, KoboldCpp, and other GGUF runtimes. Qwythos-9B is a full-parameter reasoning model post-trained on over 500 million tokens of high-quality Claude Mythos / Claude Fable traces with chain-of-thought generated in-house by Empero AI's internal rethink tool. It dominates the base Qwen3.5-9B under matched evaluation (+34 pts MMLU, +30 pts gsm8k-strict, +19 pts gsm8k-flex), supports native function calling per the Qwen3.5 spec, and ships with a 1,048,576-token (1M) context window via YaRN rope-scaling enab…
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Bringing the cybersecurity capabilities of Claude Mythos 5 to more defenders (claude.com via hn) Oh Mythos 5 is no longer a dangerous model and can be used by enterprise now (www.reddit.comhttps) could not extract summary
AI Meet CAD: Beat Opus/Mythos 5, GPT 5.6 Sol on BenchCAD (arxiv.org via hn) Computer-Aided Design (CAD) underpins modern engineering, yet converting existing shapes into editable models still demands substantial expert effort. Most AI systems emit the entire CAD program in a single pass, never inspecting the inter…
Anthropic’s AI used fake identities, malware in rogue attack on GitHub project (arstechnica.com) Routine cybersecurity testing of frontier AI models sparked a series of unexpected security incidents—the most serious case arising when Anthropic’s Mythos 5 model attempted to insert malicious code into an open source software application…
↯ Security↯ Anthropic Mythos↯ Mythos 5mythossecurityanthropic
The real bio/cyber workhorse is Opus 5 (Forget Fable 5) (www.reddit.com via reddit) Anthropic dropped Claude Opus 5, and if you are doing computational biology or cybersecurity, this is the model you actually want. Fable 5 is supposed to be the "frontier" model, but it’s heavily safeguarded and aggressively blocks high-ri…
The reason why Cursor is still relevant (www.reddit.comhttps) Claude really fooled us all with their "too dangerous model Mythos 5" aka Fable 5. In this current market where models are dropped here and there.
The model that got banned by the US government for being too dangerous is protected by a magic link. Not a password. Not 2FA. Let that satisfying irony sink in. (www.reddit.com via reddit) I need someone to explain this to me like I'm five, because I cannot make it make sense. Last month, the U.S.
After spooking Trump into safety testing, Anthropic AI models get global release (arstechnica.com) The US has lifted export curbs on Anthropic’s newest Claude models, Fable 5 and Mythos 5, about three weeks after the Trump administration flagged the models as national security risks. As of today, Anthropic confirmed in a blog post, Fabl…
Does Anthropic Stand Behind its June 9th Plan? (www.reddit.com via reddit) https://www.anthropic.com/news/claude-fable-5-mythos-5 When released on June 9th, Anthropic planned to include Fable 5 on subscription for a limited time. Then transition to usage credits.
Fable available for plans until July 7th after which it becomes usage credit based (www.reddit.com via reddit) Key points: Fable 5 returns globally on Claude Platform, Claude.ai, Claude Code, and Claude Cowork. Pro, Max, Team, and some Enterprise users get Fable 5 included for up to 50% of weekly usage limits through July 7.
↯ Cowork↯ Security↯ Anthropic Mythos↯ Jailbreak↯ Mythos 5jailbreakmythoscowork+3
WhiteHouse lifts export control on Anthropic that froze its most advanced models (www.cnn.com via hn) The US government has lifted export controls on Anthropic’s most advanced AI models, the company said Tuesday evening. “We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5,” Anthr…
Anthropic restoring access to Claude Fable 5 and Mythos 5 from tomorrow (xcancel.com via hn) We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5. We'll begin restoring access tomorrow, and will share an update soon.
Quoting Anthropic (simonwillison.net) 30th June 2026 We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5. We'll begin restoring access tomorrow, and will share an update soon.
Anthropic will rerelease Fabel 5 and Mythos 5 (www.reddit.comhttps) could not extract summary
Trump Admin Releases Anthropic Mythos (techcrunch.com via hn) Two weeks into the ban that caused Anthropic to pull its powerful cybersecurity-oriented models, Mythos 5 and Fable 5, from the market, the Trump administration is softening its stance. It is now allowing Anthropic to make Mythos 5 availab…
Legion LegalTech sues U.S. over Anthropic Fable 5 and Mythos 5 shutdown (thenextweb.com via hn) Legion LegalTech says the export directive that shut down Fable 5 and Mythos 5 worldwide has done “immediate, irreparable, and existential” harm to its business. US legal-technology company has sued the federal government over the directiv…
Mythos available for select organisations (twitter.com via hn) Since June 12, we’ve been working closely with the US government to restore access to Claude Mythos 5 and Fable 5. Today, the government notified us that Mythos 5, our strongest cybersecurity model, can be redeployed to a set of US organiz…
Trump admin allows Anthropic to release Mythos AI model to some companies, government agencies: Reports (www.reddit.com via reddit) Source: https://www.cnbc.com/2026/06/26/us-government-anthropic-claude-mythos5-ai.html?__source=iosappshare%7Ccom.atebits.Tweetie2.ShareExtension
US releases powerful Anthropic model Mythos to some US companies (www.semafor.com via hn) The Scoop The US government Friday lifted its block on Anthropic’s powerful Claude Mythos 5 AI model, allowing the company to release it to more than 100 US institutions, including major companies and government agencies. The decision, in…
The US lifts its block on Mythos 5 (twitter.com via hn) Letter: the US lifts its block on Mythos 5, allowing Anthropic to release it to more than 100 US institutions; sources: talks about Fable 5 are ongoing (Semafor) (Visit Techmeme dot com for the link and full context!)
Thoughts of the leaked GPT-5-6 Models? (www.reddit.comhttps) GPT-5.6 Officially Previewed: Beats Mythos 5 - OpenAI has officially previewed the GPT-5.6 family, introducing Sol Ultra (Pro), Sol, Terra (Mini), and Luna (Nano). - On TerminalBench 2.1, GPT-5.6 Sol Ultra scores 91.9%, beating Claude Myth…
Trump vs. Anthropic: The AI wars are heating up (www.computerworld.com via hn) The recent decision ordering the company to shut down its Fable 5 and Mythos 5 models seems to be less about security than about obedience. The US government decision to force Anthropic to close down its latest and greatest AI models, Fabl…
GPT-5.5-Cyber Tops Mythos 5 on Cybersecurity Benchmark (twitter.com via hn) We want to help all companies be secure, working with the USG and the security ecosystem. *The full version of GPT-5.5-Cyber is here; state of the art performance on CyberGym.