Anthropic builds 13M-line Lean proof of Fermat's Last Theorem, the largest ever machine-checked
davidad · x · 2026-09-05
Anthropic has announced the first end-to-end, computer-checked Lean proof of Fermat's Last Theorem: 13 million lines of Lean with 29,500 intermediate theorems, billed as "the largest Lean proof ever constructed."
- The proof code is public, with a companion blog post by Kevin Buzzard
- The community is now proposing a "speedrun"-style challenge: prove theorems in fewer Lean characters
Related event: Claude Produces First Formalized Proof of Fermat's Last Theorem in 11 Days(52 posts)→
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