OpenAI has established a pattern of major model releases on strategic timelines, with each iteration building on previous capabilities. GPT-5 is widely expected from the company, though the exact timing and feature set remain subjects of speculation within the AI community. The current market odds of 2% reflect significant skepticism that GPT-5.5 specifically will launch by April 28, 2026—just eleven days from the market's publication date. This extremely tight timeframe would require OpenAI to announce and deploy a production-ready model release within a compressed window. Historically, major model releases by OpenAI involve announcements weeks or months in advance, followed by development cycles and staged rollouts to manage server capacity and gather user feedback. The low odds suggest that traders believe a late-April release is highly unlikely given current information available in the market. If no official announcement has been made as of mid-April, a full release by month-end would represent a significant departure from OpenAI's typical release cadence. The market remains open for traders who believe an accelerated timeline is possible, though the odds structure heavily discounts that scenario. Resolution depends on official OpenAI statements and confirmed product availability to end users.