OpenAI's GPT-5.5 Launch Triggers 100% Certainty on Prediction Markets

OpenAI has officially launched GPT-5.5 across its ChatGPT and Codex platforms. This release has triggered a 100% "YES" certainty on the Polymarket prediction contract for GPT-5.5's release by April 30, 2026.

The prediction market, which tracks the release of new AI models, saw its April 30 contract reach full certainty, a rise from 98% just 24 hours prior. The June 30 contract also mirrors this 100% certainty, reflecting the resolution of speculation surrounding potential delays or a pivot to a GPT-6 model.

Trading volume for these contracts exceeded $233,000 in USDC over the past day. Despite minor price fluctuations, the market's depth ensured stability.

This development effectively ends speculative trading opportunities unless OpenAI retracts the release. The focus now shifts to adoption rates, competitive responses from rivals like DeepSeek and Anthropic, and integration announcements from key partners such as Microsoft.