GPT-5.1 Codex Max
#3SWE-rebench
by OpenAI
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About
GPT-5.1 Codex Max, released by OpenAI in November 2025, is an enhanced coding variant from the GPT-5.1 Codex line, designed for more complex software engineering tasks requiring additional reasoning depth. It targets large-scale code generation, automated refactoring, and sophisticated agentic development workflows.
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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
54.4%
Best Score
60.4%
High Performers (80%+)
0Top Categories
Coding
54.4%
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All Benchmark Results for GPT-5.1 Codex Max
Complete list of benchmark scores with detailed information
| Terminal Bench 2.0 | Coding | 60.40 | 60.4% | Unverified | |
| SWE-rebench | Coding | 48.50 | 48.5% | Unverified |