ForecastOpenAIlanguage model

GPT-5.5 Nano has not been announced. Based on how often OpenAI ships new versions, our forecast is that it arrives around November 19, 2026, probably between October 30, 2026 and January 3, 2027.

The forecast

Most likely	November 19, 2026
Window	October 30, 2026 to January 3, 2027
Chance it arrives in that window	About 18%
Follows	GPT-5.4 Nano (out March 17, 2026)
Based on	no earlier gap to learn from, so we assume about 75 days

How we got this

OpenAI is the maker of GPT-5.4 Nano. We look at the gaps between its earlier versions (GPT-5.4 Nano, 2026-03-17) and project the next one. It is a guess from a pattern, not news: the maker has not said GPT-5.5 Nano exists. This page turns into the launch page, with price and facts, as soon as the model shows up on OpenRouter, Hugging Face or GitHub.

Available now from OpenAI

Predicted automatically by Modelcast. Not affiliated with OpenAI.