GPT-5.1 Codex
by OpenAI
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About
GPT-5.1 Codex is a coding-specialized variant of GPT-5.1, engineered for software engineering workflows including automated code generation, debugging, and agentic coding tasks. It extends the GPT-5.1 improvements in reasoning and instruction-following into the coding domain, designed for professional developer tooling and autonomous coding agent frameworks.
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Timeline
ReleasedNov 19, 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 |