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GPT-5 Codex vs o3-mini
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 25.2% higher average benchmark score. o3-mini is available on 2 providers. Overall, GPT-5 Codex is the stronger choice for coding tasks.
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OpenAI
GPT-5 Codex was developed as a specialized variant of GPT-5 optimized for programming and software development tasks. Built to understand and generate code across multiple programming languages, it serves developers with enhanced capabilities for code completion, debugging, translation, and explanation of complex codebases.
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OpenAI
o3-mini was created as an efficient variant of the o3 reasoning model, designed to provide advanced thinking capabilities with reduced computational requirements. Built to make next-generation reasoning accessible to a broader range of applications, it balances analytical depth with practical speed and cost considerations.
7 months newer
o3-mini
OpenAI
2025-01-30
GPT-5 Codex
OpenAI
2025-09-15
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Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-5 Codex
Average Score:74.5%(+25.2%)
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o3-mini
Average Score:49.3%
Performance comparison across key benchmark categories
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GPT-5 Codex
Coding74.5%(+25.2%)
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o3-mini
Coding49.3%
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Knowledge Cutoff
Training data recency comparison
o3-mini
2023-09-30
GPT-5 Codex
2024-09-30
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5 Codex
0 providers
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o3-mini
2 providers
Azure
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GPT-5 Codex
Avg Score:74.5%(+25.2%)
Providers:0
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o3-mini
Avg Score:49.3%
Providers:2