Claude produced a 13-million-line, computer-checked proof of the famed conjecture in just 11 days.

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.