OpenAI releases GPT-5.3-Codex
A closed, developer-focused build that combines GPT-5's general capabilities with OpenAI's advanced code-generation stack.
GP1 English report
MODEL
GPT-5.3-Codex
- Release date:
- 2026-02-05
- Parameters:
- Unknown
- Architecture:
- Autoregressive Transformer
- Legacy modality:
- Text
- Openness:
- Closed-source
- Organization:
- OpenAI
Official links | Chat | Code Plan | Agent tools | API |
|---|---|---|---|---|
| Global |
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AI-generated