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GPT-5 Codex vs GPT-5.1 Codex
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5 Codex, released by OpenAI in August 2025, is a coding-specialized large language model from the GPT-5 family engineered for software engineering, code generation, and agentic development workflows. It builds on GPT-5's architecture with optimizations targeting multi-file code editing, test generation, and automated debugging. GPT-5 Codex targets developers and agentic coding tools requiring a model tuned specifically for programming tasks.
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OpenAI
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.
3 months newer
GPT-5 Codex
OpenAI
2025-08
GPT-5.1 Codex
OpenAI
2025-11
Average performance across 2 common benchmarks
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GPT-5 Codex
Average Score:59.3%(+1.0%)
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GPT-5.1 Codex
Average Score:58.3%
Performance comparison across key benchmark categories
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GPT-5 Codex
Coding59.3%(+1.0%)
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GPT-5.1 Codex
Coding58.3%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5 Codex
0 providers
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GPT-5.1 Codex
0 providers
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GPT-5 Codex
Avg Score:59.3%(+1.0%)
Providers:0
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GPT-5.1 Codex
Avg Score:58.3%
Providers:0