Claude builds the first fully computer-verified proof of Fermat's Last Theorem in 11 days
What mathematicians considered years of work, SI did in a week and a half: huge proofs can now be rechecked by machine in their entirety, which opens the way to verifying all of modern mathematics.
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Dozens of Claude agents, working almost autonomously, wrote 13 million lines in the Lean proof language and proved about 29.5 thousand intermediate theorems; Lean verified the result, relying only on three standard axioms. It took about 6 billion output tokens. The first attempt fell apart: the agents lost track of what had already been proved and duplicated work. Things moved forward after the open-source coordinator Prove2Me from Columbia University was added. The work builds on Kevin Buzzard's project (Imperial College) and the Mathlib library; Buzzard called it "a big step toward automatic formalization of modern mathematics," although the proof adds no new mathematics: it follows Wiles's classical 1995 line.