# GPT-5.1-Codex-Max: Product update

GPT-5.1-Codex-Max: Product update. First seen 22 Sep 2026 Catalogues list a 400,000 tokens context window. 5 evidence links.

- Kind: Sighting
- Developer: OpenAI
- Confidence: Confirmed
- First seen: 2026-09-22T12:58:33.548Z
- Model: [GPT-5.1-Codex-Max](https://alexgetman.com/models/openai/gpt-5-1-codex-max/)
- Canonical: https://alexgetman.com/signals/2026/09/22/gpt-5-1-codex-max/

## Evidence links

- [OpenCode · discovery](https://opencode.ai/data/openai/gpt-5-1-codex-max)
- [models.dev · catalogue](https://models.dev/#gpt-5.1-codex-max)
- [OpenRouter](https://openrouter.ai/openai/gpt-5.1-codex-max)
- [OpenAI · model index](https://developers.openai.com/api/docs/models/gpt-5.1-codex-max)
- [OpenAI · deprecations](https://platform.openai.com/docs/deprecations)