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GPT-5 Codex vs GPT-5.1 Codex Max
Comprehensive side-by-side LLM comparison
GPT-5.1 Codex Max leads with 10.7% higher average benchmark score. Overall, GPT-5.1 Codex Max is the stronger choice for coding tasks.
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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 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.
3 months newer
GPT-5 Codex
OpenAI
2025-08
GPT-5.1 Codex Max
OpenAI
2025-11
Average performance across 2 common benchmarks
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GPT-5 Codex
Average Score:43.7%
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GPT-5.1 Codex Max
Average Score:54.4%(+10.7%)
Performance comparison across key benchmark categories
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GPT-5 Codex
Coding43.7%
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GPT-5.1 Codex Max
Coding54.4%(+10.7%)
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 Max
0 providers
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GPT-5 Codex
Avg Score:43.7%
Providers:0
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GPT-5.1 Codex Max
Avg Score:54.4%(+10.7%)
Providers:0