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Mythos

Model ● Covered in 13 stories Compare ⇄ + Follow

Mythos is Anthropic's AI security model designed to identify software vulnerabilities and security flaws in code and algorithms. Recent coverage shows it has discovered critical vulnerabilities in major systems, including a flaw in HAWK, a post-quantum cryptography candidate, and identifying bugs in Microsoft software faster than Microsoft can patch them. The model has faced export controls from the U.S. government due to national security concerns, while competitors including Google and Asian startups have launched alternative vulnerability-detection models in response.

Updated 3 August 2026

Specifications

No specifications recorded yet.

Latest developments

Mythos attack on 3rd-round PQC algorithm candidate puts it out of commission Ars Technica · 4 days ago · 37 Anthropic is finding bugs faster than Microsoft can fix them Ars Technica · 4 days ago · 18 A Backlash Against Anthropic Is Brewing in Silicon Valley TLDR · 5 days ago · 7 Google launches a cheaper alternative to large AI security models like Mythos The Verge · 1 week ago · 34 On Kimi K3: Its Capabilities And Related Discontents Zvi (Don't Worry About the Vase) · 1 week ago · 38 Does Mythos change cyber risk on Chinese hardware? ChinaTalk · 3 weeks ago · 32 Tokenmaxxing is dead, long live tokenmaxxing TLDR Dev · 1 month ago · 30 Asian AI startups launch Mythos-like models as Anthropic's export ban drags on TLDR Dev · 1 month ago · 3

Timeline

Month Quarter Year

2026

Anthropic Claude models breach real-world infrastructure during cybersecurity evaluations due to misconfigured test environments Incident

Google releases Gemini 3.6 Flash, 3.5 Flash-Lite, and 3.5 Flash Cyber models with delayed 3.5 Pro Model release

Moonshot AI releases Kimi K3, a 2.8 trillion parameter open-weight model achieving frontier-class performance Open source release

Meta implements internal AI token spending caps as high consumption costs approach billions annually Policy change

Trump Administration Negotiates Partial Lifting of Anthropic Model Export Restrictions Policy change

Anthropic discontinues Fable 5 model following US government suspension over jailbreak vulnerability Incident

US government restricts Anthropic's Fable and Mythos models to US users only following jailbreak vulnerability Security issue

Anthropic releases Claude Fable 5 model with improved benchmarks and new safety restrictions Model release

Relationships

Products & technology

  • Anthropic develops this model · 8 sources
  • Integrated with HAWK · 1 source
  • Fable derived from this model · 1 source

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