Anthropic uses Claude to formalize proof of Fermat’s Last Theorem
Claude just formalized Fermat's Last Theorem—a proof so complex humans took 358 years to crack. Here's what that means for reasoning models.
Why it matters
Anthropic is using Claude to tackle formal mathematics verification—a concrete demonstration of reasoning capability on problems that demand deep logical chains. This is both a capability benchmark (can the model handle this class of problem?) and a lab-race signal about where frontier reasoning is headed.
The key facts
6 to knowAnthropic used Claude to formalize Fermat's Last Theorem proof
Formal proof is computer-verifiable, not just human-readable
Fermat's Last Theorem is one of mathematics' most famous and complex proofs
Original proof took 358 years (1637 to 1995) for human mathematicians to solve
Blog post published September 4, 2026
This is a capability demonstration on formal reasoning and proof verification
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Publisher excerpt: Anthropic PBC has used Claude to create a computer-verifiable version of a famous, highly complicated mathematical proof. The company detailed the project in a blog post published today. A proof is a series of arguments that proves a mathematical hypothesis is correct. The proof that Anthropic…