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GPT-5 Codex vs o4-mini
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 6.4% higher average benchmark score. o4-mini supports multimodal inputs. 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
o4-mini was created as part of the next generation of OpenAI's reasoning models, designed to continue advancing the balance between analytical capability and operational efficiency. Built to bring cutting-edge reasoning techniques to applications requiring quick turnaround, it represents the evolution of compact reasoning-focused models.
5 months newer
o4-mini
OpenAI
2025-04-16
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%(+6.4%)
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o4-mini
Average Score:68.1%
Performance comparison across key benchmark categories
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GPT-5 Codex
Coding74.5%(+6.4%)
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o4-mini
Coding68.1%
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Knowledge Cutoff
Training data recency comparison
o4-mini
2024-05-31
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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o4-mini
1 providers
OpenAI
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GPT-5 Codex
Avg Score:74.5%(+6.4%)
Providers:0
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o4-mini
Avg Score:68.1%
Providers:1