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GPT-5.1 Codex
OpenAI · proprietary · gpt-5.1-codex
GPT-5.1 Codex is a version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments. It features higher reasoning capabilities and is available in the Responses API. The underlying model snapshot is regularly updated.
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Benchmark scores
| Benchmark | Score |
|---|---|
| SWE-Bench Verified | 0.74 |
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AA metrics
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Arena Elo
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