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GPT-5.1 Codex Max vs GPT-5.3 Codex
Comprehensive side-by-side LLM comparison
GPT-5.3 Codex leads with 4.3% higher average benchmark score. Both models have their strengths depending on your specific coding needs.
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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.
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OpenAI
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.
3 months newer
GPT-5.1 Codex Max
OpenAI
2025-11
GPT-5.3 Codex
OpenAI
2026-02
Average performance across 1 common benchmarks
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GPT-5.1 Codex Max
Average Score:60.4%
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GPT-5.3 Codex
Average Score:64.7%(+4.3%)
Performance comparison across key benchmark categories
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GPT-5.1 Codex Max
Coding60.4%
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GPT-5.3 Codex
Coding64.7%(+4.3%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1 Codex Max
0 providers
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GPT-5.3 Codex
0 providers
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GPT-5.1 Codex Max
Avg Score:60.4%
Providers:0
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GPT-5.3 Codex
Avg Score:64.7%(+4.3%)
Providers:0