This market tracks whether OpenAI will release GPT-5.5 by April 20, 2026. As of early 2026, OpenAI has released GPT-4 with follow-up versions like GPT-4 Turbo and GPT-4O. The timeline for GPT-5 series models remains uncertain among industry observers, with ongoing debate about whether such a major architectural update would occur within a compressed two-month window. The current 1% YES odds reflect strong market skepticism about an April 20 launch, suggesting most traders expect a later release date or that the version jump may skip directly to GPT-6. Historically, OpenAI has spaced major model releases several months apart, with significant time between public announcement and full rollout. The market resolves based on OpenAI's official public announcement and availability of a GPT-5.5 model. With $4,771 in liquidity and 24-hour volume of $792, trading activity remains modest, indicating low conviction in an imminent release. Pricing has stayed stable near the 1% level, suggesting market consensus that April 20 is an improbable deadline for such a major release. Traders can adjust positions as new information about OpenAI's product roadmap or development progress emerges.