Fermat's Last Theorem: Anthropic has beaten me to it

Anthropic’s internal model, using the prove2.me platform, has produced a complete Lean formalization of Fermat’s Last Theorem based on the 1995 Darmon-Diamond-Taylor exposition of the Wiles–Taylor-Wiles argument, encompassing Fontaine theory and Mazur’s Eisenstein-ideal work. The repository contains over 13.4 million lines of code, requiring roughly twenty times longer to compile than Lean’s standard math library on a 96-core machine. This achievement demonstrates that large-scale auto-formalization of complex number-theoretic proofs is now feasible.