GPT-5-Codex
Notable release: A meaningful new model: a new size or version, or a strong free-to-download model from a known lab.
Key facts
- Released
- Sep 15, 2025
- What it does
- Text and chat: Writes, answers questions and holds a conversation.Code: Writes, explains and fixes code.
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- How
- For developers, through an API
- Announced as
- “Introducing upgrades to Codex”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Compare GPT-5-Codex with
It came out 18 days after gpt-realtime, the lab's previous model.
The details
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