OpenAI has officially announced the release of its GPT-5.5 model, confirming the launch date as April 23. The contract fulfillment rate for this release date has reached 100%, reflecting a significant increase from 84% a week ago. This marks a complete saturation of the market for trading on the release date, with no further capacity for trading. The daily USDC trading volume in these markets stands at $233,954. Prior to the announcement, there was a notable 3-point decline in the sub-market for April 23, suggesting traders adjusted their positions in anticipation of the news. With the release date confirmed, traders are now advised to focus on comparing GPT-5.5's performance with competing models and to watch for further announcements from OpenAI.