# GPT-5-Codex: Product update

GPT-5-Codex: Product update. First seen 15 Sep 2026 Catalogues list a 400,000 tokens context window. 6 evidence links.

- Kind: Sighting
- Developer: OpenAI
- Confidence: Confirmed
- First seen: 2026-09-15T20:42:14.405Z
- Model: [GPT-5-Codex](https://alexgetman.com/models/openai/gpt-5-codex/)
- Canonical: https://alexgetman.com/signals/2026/09/15/gpt-5-codex-high/

## Evidence links

- [OpenCode · discovery](https://opencode.ai/data/openai/gpt-5-codex)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [TrueFoundry · Azure catalogue](https://github.com/truefoundry/models/blob/main/providers/microsoft-foundry/gpt-5-codex.yaml)
- [models.dev · catalogue](https://models.dev/#gpt-5-codex)
- [OpenAI · model index](https://developers.openai.com/api/docs/models/gpt-5-codex)
- [OpenAI · deprecations](https://platform.openai.com/docs/deprecations)