OpenAI Unleashes GPT-5.5 and GPT-5.5 Pro, Markets React

OpenAI has officially announced the release of its advanced AI models, GPT-5.5 and GPT-5.5 Pro, now accessible through its API.

This development has sent prediction markets related to GPT-5.5's release soaring, with several key contracts reaching 100% certainty for their resolution. Specifically, markets predicting the model's release by April 30, 2026, and April 23, 2026, have both confirmed a "YES" outcome, indicating widespread market consensus on the AI's arrival.

The June 30, 2026, market also confirms a 100.0% YES resolution for GPT-5.5's release.

The announcement effectively concludes ongoing market speculation. With YES shares now priced at their maximum value, attention shifts to how GPT-5.5's capabilities will influence the broader AI market, including the performance of competing models such as Claude 5.