OpenAI has historically released major model updates with limited advance notice, making precise release date predictions challenging. This market centers on a specific date—April 18, 2026—requiring GPT-5.5 to launch on that exact day. The current 0% YES odds reflect trader consensus that such a precisely-timed release is highly unlikely. Major AI model releases depend on technical completion and business strategy, not calendar alignment. The market resolves by April 30, 2026, based on official OpenAI announcements and GPT-5.5 availability. The zero probability reflected in current odds suggests widespread skepticism about hitting this specific date, though unexpected announcements could shift trading dynamics. With $5,127 in available liquidity and $348 in recent trading volume, the market offers reasonable depth for participants. This prediction market appeals to traders following AI development roadmaps and OpenAI's product release strategy closely.