GPT-5.3 Codex
by OpenAI
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About
GPT-5.3 Codex, released by OpenAI in February 2026, is a coding-specialized large language model from the GPT-5.3 family. It targets software engineering workflows including automated code generation, test writing, and agentic multi-file editing, built on the incremental improvements of the GPT-5.3 generation.
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Timeline
ReleasedFeb 1, 2026
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License & Family
License
Proprietary
Performance Overview
Performance metrics and category breakdown
Overall Performance
1 benchmarks
Average Score
64.7%
Best Score
64.7%
High Performers (80%+)
0Top Categories
Coding
64.7%
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All Benchmark Results for GPT-5.3 Codex
Complete list of benchmark scores with detailed information
| Terminal Bench 2.0 | Coding | 64.70 | 64.7% | Unverified |