Claude formalizes Fermat's Last Theorem in Lean: 13M lines, 11 days, ~29,500 theorems
anirbanbandyo · x · 2026-09-10
A viral post reports that Claude formally proved Fermat's Last Theorem in Lean in 11 days: the final proof spans 13 million lines of Lean and roughly 29,500 theorems — over 5x the size of Mathlib.
- Wiles's 1990s proof took human mathematicians months of checking; this entire proof chain was machine-verified by Anthropic's model
- The author calls it "agent scale" applied to a problem the community expected to take years
- The poster adds that formal proofs were always a robot's job, and expects such proofs to flood in within a year
Note: third-party account, details unconfirmed.
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