OpenAI's release schedule for GPT-5.6 remains one of the most closely watched forecasts in the AI development community. This page aggregates prediction markets tracking whether GPT-5.6 will be released by four specific dates: May 15, May 22, May 31, and June 30, 2026. These markets are grouped together because they all center on the same underlying question—when will the next major iteration of GPT become publicly available—but break it down into a time-series structure that reveals how the market's conviction shifts as deadlines approach. The relationship between these markets is instructive. Because May 15 is the earliest deadline, its price tends to be lower than May 22, which is typically lower than May 31, which is usually lower than the June 30 market. The shape of this curve tells a story: it shows the cumulative probability that GPT-5.6 will be released by each date, and the gaps between them reflect the market's expectation about when release is most likely to occur. As you review the prices below, consider what each probability implies about the development timeline. A high price on the May 31 market combined with a much lower price on May 15 suggests the market believes release is more likely in late May. Conversely, if all four markets have similarly high prices, the consensus is that release will happen before all four dates. These predictions are anchored in the collective judgment of participants with real money at stake, making them a transparent, real-time snapshot of expert expectations about one of the most significant technological milestones in artificial intelligence development.