Anthropic ships Claude Fable/Mythos 5.2: 30% faster, formalized Fermat's Last Theorem in 30 hours
iamfakhrealam · x · 2026-11-14
Anthropic upgraded Claude Fable 5.2 and Mythos 5.2 (same underlying model), with gains in coding, reasoning and vision, and up to 30% faster output than 5.1.
Highlights:
- Pre-release feats: infeasible software migrations, 3 working electronic devices designed from scratch, substantial progress on two open black-hole physics problems, and a formalized proof of Fermat's Last Theorem in 30 hours
- Pricing: $8/M input, $40/M output; optional fast mode adds 2.5x speed at $16/$80
- Safety tiering: Fable ships with cybersecurity/biology safeguards for all users; Mythos access via the expanded Life Sciences and Cyber Verification Programs
- Third-party test: same prompt cost $10 on Fable 5.2 vs $0.30 on Gemini 4 Carbon
- Anthropic ran novel pre-release evals including sandbox-escape probes
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