A
Anthropic
2026-04-15
Product Launch Impact: Major Strength: High

Anthropic Claude Mythos: Most Powerful AI Model Restricted from Release

Summary

Anthropic released Claude Mythos, surpassing existing models on multiple benchmarks. Due to excessive safety risks, it will not be publicly released, only provided to ~50 critical infrastructure partners for defensive use.

Key Takeaways

Anthropic released Claude Mythos as a new fourth tier above Opus. Achieved 93.9% on SWE-bench Verified, 97.6% on USAMO 2026, and 100% on Cybench. Due to excessive safety risks, not publicly released, only provided to ~50 critical infrastructure partners through Project Glasswing.

Why It Matters

First landmark event where a model is too dangerous to release, marking AI safety governance shift from content-level to behavioral-level....

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Source: What LLM
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