OpenAI's release timeline for major model versions has become a key focus for AI traders and tech observers. GPT-5.5, if released, would represent a significant milestone in the company's generative AI roadmap. With April 17, 2026 already in progress, the market assigns just 1% probability to a GPT-5.5 release on this date, suggesting traders view it as highly unlikely at this late hour. This low probability reflects the rarity of major software releases dropping without prior announcement; OpenAI typically pre-announces significant versions well in advance. The market resolves based on official OpenAI announcements or widely-confirmed reports of GPT-5.5 availability today. The current odds imply traders expect either a future date for this release or that OpenAI may skip this version designation entirely in favor of different naming conventions. Volume of $886 over 24 hours indicates modest interest in this specific date outcome, though broader GPT release markets attract significantly higher liquidity. Traders holding positions here likely have conviction about longer development timelines or alternative release strategies from OpenAI.