Claude completes first formalized proof of Fermat's Last Theorem in 13M lines of Lean
AnthropicAI · x · 2026-09-05
Anthropic announced that Claude completed the first formalized proof of Fermat's Last Theorem last month — a project experts thought would take many years.
- Largest Lean proof ever: over 13 million lines of code, machine-verified via proof assistants.
- The theorem was first proven by Sir Andrew Wiles in 1995, more than 350 years after it was conjectured.
- The formalization also proves 29,000+ other theorems the proof depends on, across areas of math never before formalized.
- Anthropic frames it as a major step in firming up the core of mathematical knowledge.
Related event: Claude Produces First Formalized Proof of Fermat's Last Theorem in 11 Days(52 posts)→
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