OpenAI has established a consistent pattern of releasing major model iterations, with GPT-4 arriving in March 2023 and GPT-4 Turbo following in November 2023. GPT-5.5 would represent a potential incremental update positioned between the GPT-5 and hypothetical GPT-6 generations. The market deadline of April 30, 2026 sets a specific and verifiable window for whether such a release will occur publicly. Current odds of 4% YES indicate that traders across the market assign low probability to both an official announcement and genuine public availability within this timeframe. This subdued odds level reflects underlying skepticism about OpenAI's iteration speed, release cadence, or the strategic value of incremental point releases. The market resolves YES based on whether OpenAI officially releases GPT-5.5 to the general public—either through API access, web interface, or subscription product tier—by the stated resolution date. Trading volume and odds have remained consistently low throughout this market's lifecycle, suggesting broad sustained consensus that a major numbered release arriving within just thirteen months faces significant technical hurdles and market timing constraints. The current low price implies traders expect OpenAI to prioritize other development initiatives or deliberately space out releases at a slower cadence than this compressed timeline would require.