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GPT-5.1 Codex vs GPT-5.1 Codex Max
Comprehensive side-by-side LLM comparison
GPT-5.1 Codex Max leads with 5.6% higher average benchmark score. Overall, GPT-5.1 Codex Max is the stronger choice for coding 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.
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OpenAI
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.
Launched on the same date
GPT-5.1 Codex
OpenAI
2025-11
GPT-5.1 Codex Max
OpenAI
2025-11
Average performance across 1 common benchmarks
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GPT-5.1 Codex
Average Score:42.9%
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GPT-5.1 Codex Max
Average Score:48.5%(+5.6%)
Performance comparison across key benchmark categories
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GPT-5.1 Codex
Coding42.9%
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GPT-5.1 Codex Max
Coding48.5%(+5.6%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Codex
0 providers
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GPT-5.1 Codex Max
0 providers
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GPT-5.1 Codex
Avg Score:42.9%
Providers:0
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GPT-5.1 Codex Max
Avg Score:48.5%(+5.6%)
Providers:0