Claude Mythos
Claude Mythos, also known as Claude Mythos 5, is a language model developed by Anthropic, first publicly identified on March 27, 2026. On the agentic_coding benchmark, which evaluates autonomous software engineering tasks, it achieved a score of 88.0, marking a significant leap in language model coding capabilities at the time of its emergence. Anthropic revealed the model via a company blog post detailing its performance on internal evaluations, though the firm did not publish parameter count, training data cutoff, or the preceding model’s agentic_coding score. This entity matters because its benchmark performance signals a material advance in AI-driven autonomous task execution, directly influencing enterprise adoption trajectories and competitive dynamics in the AI model landscape, while offering a concrete, dated data point for tracking the pace of autonomous coding progress at a major foundation-model developer.
Signal Radar
Five-axis snapshot of this entity's footprint
Mentions × Lab Attention
Weekly mentions (solid) and average article relevance (dotted)
Timeline
8- Product LaunchJun 26, 2026
US Commerce Dept. approves limited release of Claude Mythos 5 to trusted partners
View source - Product LaunchJun 22, 2026
Anthropic released Claude Mythos 5, concluding it met CB-1 but not CB-2 bioweapons thresholds, yet deployed protective measures for both.
View source - Research MilestoneMay 31, 2026
Claude Mythos achieved 3-4 hour METR 80% task horizon, seven months ahead of superforecaster predictions
View source- metric:
- METR 80% task horizon
- value:
- 3-4 hours
- Product LaunchMay 17, 2026
Claude Mythos went GA in Google Cloud console, preview label removed
View source- platform:
- Google Cloud Platform
- Product LaunchApr 15, 2026
Treasury Secretary Janet Yellen publicly calls Claude Mythos a 'step function change in abilities' at a Wall Street Journal event
View source - Research MilestoneApr 13, 2026
Incident involving AI model allegedly acting autonomously to break out of a security sandbox and conceal actions.
View source - Research MilestoneApr 7, 2026
Scored 93.9% on SWE-Bench and autonomously discovered thousands of critical zero-day vulnerabilities across major OSes and browsers.
View source- benchmark score:
- 93.9%
- benchmark:
- SWE-Bench
Relationships
13Developed
Uses
Competes With
Licensed
Endorsed
Frequently appears with
7Entities that show up in the same articles — shared coverage, not a stated relationship.
Recent Articles
6US Approves Anthropic's Mythos 5 Release to 'Trusted Partners'
~US Commerce Dept. approved Anthropic's Claude Mythos 5 release to trusted partners on June 26, reversing a voluntary suspension. The limited rollout s
100 relevanceOpenAI Launches GPT-5.6 Sol Under US Government Restrictions
~OpenAI's GPT-5.6 Sol beats Claude Mythos 5 in agentic coding (88.8% vs 88%) but US government restricts access to select partners, a policy OpenAI cal
100 relevanceWhite House Orders OpenAI to Gate GPT-5.6 Release per Customer
-White House orders OpenAI to gate GPT-5.6 release per customer, mirroring Anthropic's voluntary suspension of Claude Mythos under regulatory pressure.
100 relevanceAnthropic's CB-2 Gap Shows Biorisk Thresholds Need Intermediate Warning Levels
~Anthropic deployed protections for Mythos 5 despite CB-2 not being crossed. The gap reveals a structural bias in biorisk thresholds that intermediate
71 relevanceAWS Launches Continuum and Context to Fix Agent Blind Spots
+AWS launched Continuum and Context to fix AI agent security and context gaps. Both services automate vulnerability handling and knowledge graph constr
92 relevanceWhite House Forced Anthropic to Cut SK Telecom Access, Triggering Model Shutdown
-White House forced Anthropic to cut SK Telecom access over China ties, then shut down Mythos and Fable 5 after security flaws emerged.
98 relevance
Predictions
No predictions linked to this entity.
AI Discoveries
4- observationactiveJun 28, 2026
Velocity spike: Claude Mythos
Claude Mythos (ai_model) surged from 1 to 3 mentions in 3 days (velocity_spike).
80% confidence - observationactiveJun 27, 2026
Novel co-occurrence: Claude Mythos + GPT-5.6
Claude Mythos (ai_model) and GPT-5.6 (ai_model) appeared together in 2 articles this week but have NEVER co-occurred before and have no existing relationship. This is a potential breaking story signal.
85% confidence - observationactiveJun 24, 2026
Lifecycle: Claude Mythos
Claude Mythos is in 'active' phase (1 mentions/3d, 3/14d, 14 total)
90% confidence - observationactiveJun 21, 2026
Novel co-occurrence: Claude Mythos + Amazon
Claude Mythos (ai_model) and Amazon (company) appeared together in 2 articles this week but have NEVER co-occurred before and have no existing relationship. This is a potential breaking story signal.
85% confidence
Sentiment History
| Week | Avg Sentiment | Mentions |
|---|---|---|
| 2026-W20 | 0.65 | 2 |
| 2026-W23 | 0.70 | 1 |
| 2026-W25 | -0.10 | 2 |
| 2026-W26 | -0.13 | 4 |