Anthropic's Claude Formalizes Fermat's Last Theorem in Lean in 11 Days

My take: Mathematicians estimated that formalizing Wiles' proof in the Lean verification language would take several years. Claude completed the task in 11 days, generating 13 million lines of code and 29,500 verified intermediate theorems. It is the largest Lean file ever created, five times the size of the language's main library.

For professionals in research, rigorous analysis, or any discipline that depends on sustained logical reasoning, this result is concrete: AI can now collaborate on high-level intellectual work at a scale humans simply cannot match alone.

It is worth noting that this result was published by Anthropic using one of their own internal research models, so the timelines and scale figures are worth reading with your own judgment. The good news is that the Lean code is computer-verifiable and the repository is on GitHub for the math community to review independently.

If you have complex analysis projects you currently leave unfinished due to time or bandwidth, which ones could move forward with a sustained AI collaboration over days, not just minutes?