Anthropic announced that Claude completed the first machine-verified formalization of Fermat's Last Theorem, a project experts expected would take years. The Lean proof exceeds 13 million lines—the largest ever written—and also formalizes more than 29,000 supporting theorems. Anthropic frames it as a major step toward AI-assisted verification of mathematical knowledge.

Key Takeaways

  • ✓Over 13 million lines of Lean, the largest formal proof ever written
  • ✓Also formalizes 29,000+ supporting theorems across mathematics
  • ✓The complete proof is available on GitHub
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