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GPT-5 Codex vs GPT-5.3 Codex
Comprehensive side-by-side LLM comparison
GPT-5.3 Codex leads with 21.3% higher average benchmark score. Overall, GPT-5.3 Codex 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-5.3 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.
6 months newer
GPT-5 Codex
OpenAI
2025-08
GPT-5.3 Codex
OpenAI
2026-02
Average performance across 1 common benchmarks
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GPT-5 Codex
Average Score:43.4%
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GPT-5.3 Codex
Average Score:64.7%(+21.3%)
Performance comparison across key benchmark categories
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GPT-5 Codex
Coding43.4%
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GPT-5.3 Codex
Coding64.7%(+21.3%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5 Codex
0 providers
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GPT-5.3 Codex
0 providers
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GPT-5 Codex
Avg Score:43.4%
Providers:0
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GPT-5.3 Codex
Avg Score:64.7%(+21.3%)
Providers:0