OpenAI released GPT-5.5 on April 23, 2026, resolving the April 30 market at 100% YES.
The April 23 market jumped from 93% to 100% within 24 hours of the release. The term structure is now a flat line at 100% from April 23 through June 30, confirming absolute certainty across all related markets that GPT-5.5 shipped on time.
Daily volume on the April 30 market hit $30,936 in actual USDC traded. The April 23 market was far more active at $182,552 in daily USDC volume. The largest move in the April 23 sub-market was a brief 3-point dip at 5:37 PM that corrected almost immediately, likely a momentary trader reaction rather than any real uncertainty.
OpenAI’s release cadence has been aggressive, matching or outpacing Google and Anthropic. A YES share bought at 93¢ just a day ago now returns a full $1, a clean win for anyone who bet on a timely release.
Watch for further OpenAI announcements about GPT-5.6 or other upcoming releases. Sam Altman’s communications and updates on OpenAI’s blog or Help Center will signal the next steps in their model rollout schedule.
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