AnthropicAnalysisScienceSeptember 4, 2026

Claude formalizes Fermat's Last Theorem in 11 days

Anthropic says Claude worked largely autonomously to produce the first end-to-end computer-checked proof of Fermat's Last Theorem, writing 13 million lines of Lean and proving 29,500 intermediate theorems. Kevin Buzzard, who leads a human Lean formalization effort at Imperial College London started in 2024, reviewed the proof and confirmed it holds.

People · Kevin Buzzard, Tianyi Peng

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