OpenAI’s September 2026 announcement that a multi-agent system built on an internal large language model produced a Lean-formalized proof of a finite-time singularity for the Navier-Stokes equations—one of the remaining Millennium Prize Problems—has anchored trader expectations. While the result demonstrated impressive scaling of AI agents for complex mathematical reasoning, Clay Mathematics Institute review remains ongoing and unhurried, with no official prize awarded. Subsequent claims on related problems such as Yang-Mills or Riemann have been partial rather than complete resolutions. With only weeks left in 2026 and no further verified breakthroughs reported, the 87% implied probability on zero additional solutions reflects the technical barriers, resource intensity, and slow formal validation timelines typical for these problems.