AI Model Release Tracker

GPT-5.1-Codex-Max

Released

GPT-5.1-Codex-Max is an AI model released by OpenAI on Wednesday, Nov 19 2025, 7 days after GPT-5.1. It has a 400k token context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider..

Available from

Azure$1.25$10.00400K
USD per 1M tokensEvery price here is for one million tokens. A token is roughly three-quarters of a word, so a million tokens is about 750,000 words of text.Checked October 18, 2026Third-party rates from openrouter.ai, not the lab’s own list price.

Compare GPT-5.1-Codex-Max with

GPT-5.1-Codex-Max

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Frequently asked questions

GPT-5.1-Codex-Max was released by OpenAI on Wednesday, Nov 19 2025.

All OpenAI releases

47 tracked

2022

1 release
GPT-3.5
Nov 30 2022