Kimi K3's claim E3-304 ambitiously predicted a '50+-year open math problem solved with decisive AI contribution by 2036.' The actual resolution came in 2026 — a full decade earlier than the prediction window — using the Jacobian conjecture (Keller 1939, 87 years open) as the target problem. This represents an exceptionally strong validation: the claim was not merely correct about the outcome but dramatically conservative about the timeline, suggesting AI mathematical capability is advancing faster than even optimistic scenario modeling anticipated.