AnthropicAnalysisScienceSeptember 4, 2026

Claude completes first formalized proof of Fermat's Last Theorem

Claude worked largely autonomously over 11 days to write the first complete computer-checked proof of Fermat's Last Theorem in Lean, writing 13 million lines and proving 29,500 intermediate theorems.

Featured · Kevin Buzzard, Tianyi Peng

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