Claude Completes First Formalized Proof of Fermat's Last Theorem in 13M Lines of Lean
ctjlewis · x · 2026-09-05
Anthropic announced that Claude has completed the first formalized proof of Fermat's Last Theorem, converting Andrew Wiles' 1995 reasoning into Lean code that proof assistants can machine-verify — a task experts expected to take years.
- The proof totals over 13 million lines of code, the largest Lean proof ever written
- It also formalizes more than 29,000 supporting theorems the proof depends on
- The theorem took 350+ years to prove by hand; formalization now makes it fully machine-verifiable
A landmark result for AI on high-level mathematics and for the formalization approach to mathematical rigor.
Related event: Claude Produces First Formalized Proof of Fermat's Last Theorem in 11 Days(52 posts)→
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