Kevin Buzzard verifies Anthropic's 13.4M-line Lean proof of Fermat's Last Theorem
AlexKontorovich · x · 2026-09-05
Mathematician Alex Kontorovich shared Kevin Buzzard's blog post independently verifying Anthropic's Lean formalization of Fermat's Last Theorem.
- Buzzard compiled the codebase and ran comparator — it checks out
- The proof spans over 13.4 million lines and takes 20x longer to compile than mathlib on a 96-core machine; even a 500GB RAM machine stutters browsing the repo
- It completes the final item on Wiedijk's list of 100 formalization challenges, following the Darmon–Diamond–Taylor (1995) route
Same event as Anthropic's official announcement, with Buzzard's verification adding mathematical-community credibility.
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