AI Delivers Record-Setting Fully Computer-Checked Proof of Fermat’s Last Theorem in 11 Days

Anthropic's Claude AI produced the first fully computer-checked formal proof of Fermat's Last Theorem in 11 days, generating about 13 million lines of code and passing review by mathematician Kevin Buzzard. The effort, which used parallel AI agents and the Prove2Me tool to keep progress coordinated, translates Andrew Wiles's proof into Lean, a form verifiable by computers. A parallel human project at Imperial College London started in 2024 to do the same work but has not yet finished, making Claude's result notable for speed and determinism in formalized math.