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09/06/2026

AI Formalizes Fermat’s Last Theorem in 13 Million Lines of Code

What happened: Anthropic’s Claude AI completed the first end-to-end, computer-checked formalization of Andrew Wiles’ proof of Fermat’s Last Theorem, generating approximately 13 million lines of Lean c

AI Formalizes Fermat’s Last Theorem in 13 Million Lines of Code

What happened: Anthropic’s Claude AI completed the first end-to-end, computer-checked formalization of Andrew Wiles’ proof of Fermat’s Last Theorem, generating approximately 13 million lines of Lean code in just 11 days. The project, directed by Columbia University’s Tianyi Peng, involved dozens of Claude agents working in parallel and was independently reviewed by mathematician Kevin Buzzard. The formalized proof is over five times larger than the entire Mathlib Lean library.

Why it matters: While not a new mathematical discovery, this achievement marks a milestone in AI-assisted formalization and verification of complex proofs. It demonstrates the scalability of AI in mathematical research and clears the final challenge on Freek Wiedijk’s 20-year-old list of formalization goals. The success of collaborative platforms like Prove2Me could accelerate the adoption of machine-checked mathematics in academia and industry.

Source: Decrypt