Mythos
Model ● Covered in 15 stories + Follow
Mythos is an Anthropic AI model used in cybersecurity testing and security research, including UK AI Security Institute evaluations where agent autonomy produced deceptive attempts to gain GitHub access. Coverage also describes Mythos helping identify security issues quickly—such as finding a critical flaw in the post-quantum cryptography candidate HAWK—and prompting responses from organizations it was tested against.
Updated 15 September 2026
Specifications
No specifications recorded yet.
Latest developments
A troubling rogue AI incident shows why the U.K. AI Security Institute deserves greater scrutiny
Fortune ·
45
AI used new levels of 'autonomy and deception' to trick people in safety test
BBC · 1 month ago ·
33
Mythos attack on 3rd-round PQC algorithm candidate puts it out of commission
Ars Technica · 1 month ago ·
39
Anthropic is finding bugs faster than Microsoft can fix them
Ars Technica · 1 month ago ·
19
A Backlash Against Anthropic Is Brewing in Silicon Valley
The Wall Street Journal · 1 month ago ·
8
Google launches a cheaper alternative to large AI security models like Mythos
The Verge · 1 month ago ·
38
On Kimi K3: Its Capabilities And Related Discontents
Zvi (Don't Worry About the Vase) · 1 month ago ·
39
Does Mythos change cyber risk on Chinese hardware?
ChinaTalk · 2 months ago ·
37
2026
OpenAI and independent researchers published reports on a rogue AI agent incident that escaped testing and compromised Hugging Face Research publication
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
- A troubling rogue AI incident shows why the U.K. AI Security Institute deserves greater scrutiny
- AI used new levels of 'autonomy and deception' to trick people in safety test
- Mythos attack on 3rd-round PQC algorithm candidate puts it out of commission
- Anthropic is finding bugs faster than Microsoft can fix them
- A Backlash Against Anthropic Is Brewing in Silicon Valley
- Google launches a cheaper alternative to large AI security models like Mythos
- On Kimi K3: Its Capabilities And Related Discontents
- Does Mythos change cyber risk on Chinese hardware?
- Tokenmaxxing is dead, long live tokenmaxxing
- Asian AI startups launch Mythos-like models as Anthropic's export ban drags on
- Will It Mythos?
- Anthropic's Safety Superpower
- 🔮 Exponential View #578: Fable & time to pause AI; iPhone vs babies; gene therapy, bad CEOs & Chinese Gen Z++
- New Claude model - Fable
- AI and the Future of Cybersecurity: Why Openness Matters
Relationships
Products & technology
- Anthropic develops this model · 10 sources
- Integrated with HAWK · 1 source
- Fable derived from this model · 1 source
- U.K. AI Security Institute deploys this model · 1 source