This market will resolve to "Yes" if OpenAI retracts its Navier-Stokes solution between market creation and December 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". OpenAI's Navier-Stokes solution refers to the Navier-Stokes solution that OpenAI announced on September 8, 2026 (https://openai.com/index/navier-stokes-solution/). A qualifying retraction occurs when OpenAI officially and publicly states that the published proof was incorrect or does not solve the Navier-Stokes problem. Statements by any other party will not qualify. Revisions that do not retract the correctness of the initial proof as a solution to the Navier-Stokes problem will not qualify. Statements about the authorship, credit, or attribution of the result, or about whether it qualifies for the Millennium Prize, will not on their own qualify. The primary resolution source for this market will be official information from OpenAI; however, a consensus of credible reporting may also be used.