Claude Writes Computer-Verified Proof of Fermat's Last Theorem
Anthropic has published a computer-verified proof of Fermat's Last Theorem. The AI model Claude generated the proof in the Lean programming language over eleven days of autonomous work.
What happened?
Anthropic has published what is described as the first complete, computer-verified proof of Fermat's Last Theorem. The AI model Claude worked largely autonomously for 11 days to write the proof in the Lean programming language. The proof builds upon mathematician Sir Andrew Wiles's historical paper proof from 1995.
Key facts
| AI-modell | Claude |
|---|---|
| Programmeringsspråk | Lean |
| Tidsåtgång | 11 dagar |
| Publiceringsdatum | 4 september 2026 |
”We are sharing the first complete computer-checked proof of Fermat’s Last Theorem. Claude worked largely autonomously over 11 days to write the proof in the Lean programming language.”
Why it matters
Translating a 129-page complex mathematical proof into code that a computer can verify has previously required years of manual effort by mathematical experts. The fact that an AI model was able to perform the majority of the formalisation in just over a week marks a clear advancement in automated research and computerised mathematics.
Who is affected?
The news primarily concerns researchers in mathematics, computer science, and AI development. Developers working with automated theorem proving and formal verification gain a new reference case for how large-scale reasoning capabilities can be applied.
Impact on the EU
The work is not directly affected by EU-specific AI regulations such as the EU AI Act, but it is being made available globally as open source. This means that researchers and mathematicians within the EU can freely review and use the proof.
What else you should know
The foundational work is based on the formal mathematics within the Lean environment and has been shared publicly by Anthropic for further review by the mathematical community.
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