A 90-Year Question Answered Twice in One Week

On September 8, 2026, OpenAI announced it had resolved the Navier-Stokes existence and smoothness problem. The Navier-Stokes Millennium Prize has stood unclaimed since the Clay Mathematics Institute listed it among seven great unsolved problems in 2000. Days earlier, NYU mathematician Tristan Buckmaster, working with Anthropic researcher Levent Alpöge, announced three related proofs of his own. Then came the accusation. Buckmaster claims OpenAI learned of his unpublished approach and threw enormous compute at reproducing it first. This article goes deep into both the mathematics and the controversy, at a level Navier and Stokes themselves would recognize.