About GPT-5.1-Codex-Max

GPT-5.1-Codex-Max is an AI model released by OpenAI on Nov 19 2025, 7 days after GPT-5.1. It is the 25th tracked release from OpenAI out of 31 total.

About OpenAI: Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.