Anthropic releases Claude Fable 5.2 and Mythos 5.2: formalized Fermat's Last Theorem in 30 hours
claudeai · x · 2026-11-10
Anthropic launched Claude Fable 5.2 and Mythos 5.2 (same underlying model; Mythos access via application for cybersecurity/biomedical orgs). Prerelease highlights: infeasible software migrations, 3 working electronic devices designed from scratch, 2 open black hole physics problems, and Fermat's Last Theorem formalized in 30 hours. Outputs up to 30% faster than 5.1, priced at $8/M input and $40/M output tokens; optional fast mode (2.5x speed) at $16/$80. New evals probe sandbox escapes and misalignment risks.
Related event: Anthropic Launches Claude Fable 5.2 and Mythos 5.2, Faster and Cheaper(79 posts)→
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