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AI helps check a famous mathematical proof

What changedAnthropic says its Claude assistants spent eleven days turning Fermat’s Last Theorem into a proof that checking software can inspect step by step. The team has shared the result and code. It is a new way to check an existing proof, rather than a newly discovered theorem.

Anthropic illustration for its Fermat’s Last Theorem formalization

The useful part

Why it matters

Work that can be checked at each step offers a promising way to make AI’s contributions easier to trust.

Keep in mind

Good to know

The result is Anthropic’s reported work; it does not show that AI can solve every difficult maths problem.

Evidence

Primary source

Anthropic

Read the complete 6 September 2026 edition