Prove2Me: Claude agents wrote 13M lines of Lean in 11 days to formalize Fermat's Last Theorem

liuzhuang1234 · x · 2026-09-21

Prove2Me is an open, collaborative, agent-native platform for scaling the formalization of mathematics, aiming to formalize every research paper past and future so peer review becomes faster and more trustworthy, with a single verified foundation any human or agent can build on. It recently served as the collaboration platform behind Anthropic's formalization of Fermat's Last Theorem — the first complete computer-checked proof of the theorem — with Claude agents writing 13 million lines of Lean in 11 days.

The platform decomposes results into small Lean 4 missions anyone can tackle, plus experimental campaigns tracking shared mathematical goals (e.g., primes summing to odd numbers, the matrix multiplication exponent ω). It also emphasizes making formal math explorable and questionable by humans, arguing human understanding isn't something AI can replace.

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