OpenAI’s September 8 release of a Lean-formalized proof establishing finite-time singularities in forced 3D Navier-Stokes equations under smooth forcing has anchored the 93% market-implied probability against retraction. The public GitHub repository enables rapid independent verification of the analytical write-up and machine-checked formalization, while scrutiny has centered on priority disputes with external mathematicians rather than identified errors in the result itself. The Clay Mathematics Institute has noted the claim as active but maintains its deliberate review timeline through year-end. A realistic reversal would require discovery of substantive flaws during peer validation or formal rechecking, though the scale of the multi-agent effort and verifiable artifacts make such an outcome improbable absent new discrepancies.