Anthropic ships Claude Fable 5.2 and Mythos 5.2, formalized Fermat's Last Theorem in 30 hours
FinanceYF5 · x · 2026-11-12
Anthropic released Claude Fable 5.2 and Mythos 5.2 — same underlying model, with Fable carrying cybersecurity/biology safeguards for all users and Mythos gated behind its Life Sciences and Cyber Verification programs.
Key claims from prerelease testing:
- Formalized the proof of Fermat's Last Theorem in 30 hours; solved two open black-hole physics problems; completed otherwise-infeasible software migrations; designed three working electronic devices from scratch.
- Up to 30% faster output than 5.1, cheaper at $8/M input and $40/M output tokens; optional fast mode (up to 2.5x speedup) at $16/$80.
- Improved coding, reasoning, and vision; new safety evals probing behaviors like sandbox escapes.
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