GPT-5.3-Codex
- Made by
- OpenAI
- Released
- Announced in
- Introducing GPT-5.3-Codexopenai.com
- Event
- GPT-5.3-Codex
- API record
- /api/v1/models/gpt-5-3-codex
Benchmark results
| Benchmark | Score | Source check |
|---|---|---|
| SWE-bench Proxhigh reasoning effort | 56.8% | CheckedA person checked this number against its source on 17 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced. |
| GPQA Diamondreported later, in Introducing GPT-5.4 | 92.6% | CheckedA person checked this number against its source on 20 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced. |
| BrowseCompreported later, in Introducing GPT-5.4 | 77.3% | CheckedA person checked this number against its source on 20 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced. |
Sources
Reported by OpenAI
- Introducing GPT-5.3-Codexopenai.com · 5 Feb 2026
Our capture of the source - Introducing GPT-5.4openai.com · 5 Mar 2026
Our capture of the source 
Our capture of the source