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Anthropic Proves Fermat's Last Theorem Using Lean and Claude Code Agent Harness
Anthropic produced the first complete, computer-verified proof of Fermat's Last Theorem in Lean over 11 days. Dozens of Claude agents proved 29,500 intermediate theorems across 13 million lines of code.
September 5, 2026 2 min read
Curated by Oleksandr Kuzmenko, AI Product EngineerUpdated September 5, 2026Sources cited on every story
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Why it matters
Anthropic produced the first complete, computer-verified proof of Fermat's Last Theorem in Lean over 11 days. Dozens of Claude agents proved 29,500 intermediate theorems across 13 million lines of code.