OpenAI has a consistent history of releasing major language models, with GPT-4 arriving in March 2023 and iterative improvements rolling out through 2024 and 2025. GPT-5.5 would represent a significant architectural advancement beyond current generation capabilities, as suggested by the major version increment. This prediction market expires on April 21, 2026, providing just over three weeks from today for OpenAI to officially announce and release the model to the public. Resolution will depend on official confirmation from OpenAI or credible third-party news verification that GPT-5.5 is available for user access. The current 3% YES odds reflect substantial market skepticism about an imminent release within this timeframe. Historically, OpenAI has maintained intervals of 12–18 months between major model releases, and no credible industry reports have surfaced suggesting an accelerated development timeline toward late April 2026. The odds trajectory has remained anchored near 3% since the market's inception, indicating limited conviction among traders that a GPT-5.5 release is imminent. Those tracking this market typically monitor OpenAI's official announcements, developer conference schedules, research publications, patent filings, and industry intelligence for signals suggesting accelerated development cycles.