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GPT-5 Codex vs o3-mini
Comprehensive side-by-side LLM comparison
o3-mini leads with 54.1% higher average benchmark score. o3-mini is available on 2 providers. Overall, o3-mini is the stronger choice for coding tasks.
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OpenAI
GPT-5 Codex is a language model developed by OpenAI. It achieves strong performance with an average score of 74.5% across 1 benchmarks. Notable strengths include SWE-Bench Verified (74.5%). Released in 2025, it represents OpenAI's latest advancement in AI technology.
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OpenAI
o3-mini is a language model developed by OpenAI. The model shows competitive results across 26 benchmarks. It excels particularly in COLLIE (98.7%), MATH (97.9%), IFEval (93.9%). It supports a 300K token context window for handling large documents. The model is available through 2 API providers. Released in 2025, it represents OpenAI's latest advancement in AI technology.
7 months newer
o3-mini
OpenAI
2025-01-30
GPT-5 Codex
OpenAI
2025-09-15
Performance Metrics
Context window and performance specifications
Average performance across 26 common benchmarks
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GPT-5 Codex
Average Score:2.9%
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o3-mini
Average Score:56.9%(+54.1%)
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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:2.9%
Providers:0
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o3-mini
Avg Score:56.9%(+54.1%)
Providers:2