In a stark forecast for the AI landscape, prediction market participants on Polymarket have priced OpenAI's chances of retaining the best AI model title by June 2026 at zero percent. The market, which has attracted $1.7 million in volume, reflects a consensus that competitors such as Google DeepMind, Anthropic, or emerging players will surpass OpenAI's capabilities within the next two years. No other prediction platforms—Kalshi or Manifold—currently offer contracts on this question, making Polymarket the sole gauge of trader sentiment. The 0% probability is a rare and extreme signal in prediction markets, typically reserved for events seen as virtually impossible. While no specific news headlines triggered this shift, the market's sustained zero suggests traders are betting on a fundamental shift in AI leadership, possibly driven by rapid advances in rival models or internal challenges at OpenAI. The lack of data from other platforms limits cross-validation, but the high volume on Polymarket indicates strong conviction among participants.