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Anthropic's Fermat Proof Is an Autoformalization Milestone

Anthropic says Claude worked largely autonomously for 11 days to formalize Fermat's Last Theorem in Lean. The developer lesson is less about one theorem and more about verified repo-scale research artifacts.

September 5, 2026•7 min read

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OpenAI Publishes Ten Decade-Open Math Proofs, Each Formalized in Lean

OpenAI's next model, codenamed Astra, produced results on ten problems open for at least a decade - including non-sofic groups and Erdős problems 146, 180, and 183 - with every argument formalized as a Lean certificate.

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Anthropic's Fermat Proof Is an Autoformalization Milestone

OpenAI Publishes Ten Decade-Open Math Proofs, Each Formalized in Lean

Keep exploring Lean

Get Smarter About AI Dev

LEAN

Anthropic's Fermat Proof Is an Autoformalization Milestone

OpenAI Publishes Ten Decade-Open Math Proofs, Each Formalized in Lean

Keep exploring Lean

Get Smarter About AI Dev