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GPT-5 Codex vs o1-mini
Comprehensive side-by-side LLM comparison
o1-mini leads with 51.0% higher average benchmark score. o1-mini is available on 2 providers. Overall, o1-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
o1-mini is a language model developed by OpenAI. It achieves strong performance with an average score of 71.9% across 6 benchmarks. It excels particularly in HumanEval (92.4%), MATH-500 (90.0%), MMLU (85.2%). It supports a 194K token context window for handling large documents. The model is available through 2 API providers. Released in 2024, it represents OpenAI's latest advancement in AI technology.
1 year newer
o1-mini
OpenAI
2024-09-12
GPT-5 Codex
OpenAI
2025-09-15
Performance Metrics
Context window and performance specifications
Average performance across 7 common benchmarks
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GPT-5 Codex
Average Score:10.6%
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o1-mini
Average Score:61.6%(+51.0%)
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Knowledge Cutoff
Training data recency comparison
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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o1-mini
2 providers
Azure
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GPT-5 Codex
Avg Score:10.6%
Providers:0
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o1-mini
Avg Score:61.6%(+51.0%)
Providers:2