Converting the proof of Fermat's last theorem into code that computers can check was expected to take years. Anthropic's Claude AI managed it in less than two weeks

Anthropic's Claude AI completed the first machine-checked formalization of Fermat's Last Theorem in Lean 4, verifying over 29,500 theorems

Anthropic's Claude formalized Fermat's Last Theorem in 11 days. Anthropic has the best AI model by September 2026 at 85.5% YES.