ForecastOpenAIcoding model

GPT-5.4-Codex has not been announced. Based on how often OpenAI ships new versions, our forecast is that it arrives around November 9, 2026, probably between October 30, 2026 and December 3, 2026.

The forecast

Most likely	November 9, 2026
Window	October 30, 2026 to December 3, 2026
Chance it arrives in that window	About 30%
Follows	GPT-5.3-Codex (out February 24, 2026)
Based on	1 earlier gap between versions

How we got this

OpenAI is the maker of GPT-5.3-Codex. We look at the gaps between its earlier versions (GPT-5.2-Codex, 2026-01-14; GPT-5.3-Codex, 2026-02-24) and project the next one. It is a guess from a pattern, not news: the maker has not said GPT-5.4-Codex 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.