Anthropic claims AI-assisted proof of Fermat's Last Theorem, beating formalization effort

ravenical · hn · 2026-09-05

Kevin Buzzard, who leads the Xena project formalizing mathematics in Lean, published a post titled "FLT: Anthropic has beaten me to it," saying Anthropic used AI to produce a proof of Fermat's Last Theorem ahead of his long-running formalization effort.

Fermat's Last Theorem previously had only Wiles's hundreds-page proof, and the Xena project has been working for years to formalize it. If confirmed, an AI-first proof would be a landmark moment for AI for Science.

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