OpenAI’s September 2026 multi-agent resolution of the Navier-Stokes existence and smoothness problem—verified via Lean formalization after roughly 88 hours of computation—represents the sole AI-attributed Millennium Prize advance this year, prompting the Clay Mathematics Institute to note it has “apparently been settled” while emphasizing its unhurried two-year scrutiny process. With only weeks remaining in 2026 and no comparable official announcements or verified breakthroughs on the remaining open problems such as the Riemann hypothesis or P versus NP, traders assign 77% implied probability to zero additional solutions. Subsequent October releases of hundreds of machine-generated results across other math domains have not extended to further Millennium claims, reinforcing the market’s assessment that verification timelines and problem complexity limit near-term progress.