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TLDRocket
5 September 2026
The most significant AI story today isn’t about faster chatbots or flashier demos—it’s about taking one of math’s most famous proofs and turning it into something machines can verify. Anthropic reports that it used Claude to formalize Andrew Wiles’ proof of Fermat’s Last Theorem in Lean, producing a computer-checkable artifact written in 13 million lines of Lean code. The work reportedly took 11 days, ending with a proof file that any Lean setup can re-check automatically, trading the messy tail risk of human reasoning for the blunt certainty of formal verification.
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