GPT-5.1 Codex
by OpenAI
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About
GPT-5.1 Codex, released by OpenAI in November 2025, is a coding-specialized model from the GPT-5.1 family engineered for software engineering tasks including code generation, multi-file editing, and agentic development. It targets developers and automated coding pipelines requiring a GPT-5.1-generation model tuned for programming.
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Timeline
ReleasedNov 1, 2025
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License & Family
License
Proprietary
Performance Overview
Performance metrics and category breakdown
Overall Performance
2 benchmarks
Average Score
58.3%
Best Score
73.7%
High Performers (80%+)
0Top Categories
Coding
58.3%
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All Benchmark Results for GPT-5.1 Codex
Complete list of benchmark scores with detailed information
| SWE Bench Verified | Coding | 73.70 | 73.7% | Unverified | |
| SWE-rebench | Coding | 42.90 | 42.9% | Unverified |