Proof
Claude wrote Fermat in Lean. Eleven days. Thirteen million lines.
Mathematicians had budgeted five years. 29,500 intermediate theorems, checked.
The Rocket News · Science · San FranciscoSeptember 13, 2026 · 4 min read
Anthropic’s Claude formalized Fermat’s Last Theorem in the Lean proof language in 11 days, The Hindu reported Sunday. Thirteen million lines. 29,500 intermediate theorems, machine-checked. Mathematicians had put the translation at about five years. The Science desk files a proof that no longer waits for a person to turn the page.
Formalization means every step is code. Software verifies it from first principles. Wiles proved the theorem in 1995. The work of turning that argument into Lean was the slog. Claude did the slog. The agencies that want the Moon in code put a lunar model on Hugging Face on Thursday. This is the other shop.
Claude achieved it in 11 days, generating over 13 million lines of code.
Video
The Science desk files Sunday as it is: a 17th-century margin, a 1995 paper, and a model that wrote the rest in a week and a half.
Wire and further reading: thehindu.com
Filed under Science
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