OpenAI’s September 8, 2026 announcement that an internal large language model directed 10,000 AI agents to produce a Lean-formalized proof of a Navier-Stokes singularity in 88 hours remains the dominant catalyst for trader sentiment on any follow-on Millennium Prize claim. The company explicitly declined to pursue the $1 million prize and has since released results on over 300 additional open math problems without claiming further Millennium solutions. Competitive pressure from Anthropic-linked researchers working on related Euler equations, combined with ongoing scrutiny over data provenance and formal verification standards, keeps market-implied odds sensitive to new model releases or developer conferences. Any credible announcement resolving a remaining problem such as the Riemann hypothesis or P vs NP before year-end would sharply shift consensus.