AI systems remain ineligible to enter the IMO as official contestants or receive medals, as the contest restricts participation to human high school students under age 20, keeping the probability of an actual "win" low at the current market-implied odds. Multiple frontier large language models achieved perfect 42/42 scores or gold-medal thresholds on the 2026 Shanghai problems through independent testing and limited official grading channels, including systems from Huawei, Xiaohongshu, OpenAI, and Anthropic, building on 2025 gold-level results from Gemini Deep Think and similar models. These demonstrations highlight rapid gains in rigorous proof-based reasoning yet occur outside formal competition rules, with no regulatory or organizational changes expected to alter eligibility before resolution. Traders appear to weigh the strict participation criteria and post-event timing as decisive swing factors over raw capability benchmarks.