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GPT-5 Codex vs o1-preview
Comprehensive side-by-side LLM comparison
o1-preview leads with 55.5% higher average benchmark score. o1-preview is available on 2 providers. Overall, o1-preview 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-preview is a language model developed by OpenAI. It achieves strong performance with an average score of 64.8% across 8 benchmarks. It excels particularly in MGSM (90.8%), MMLU (90.8%), MATH (85.5%). It supports a 161K 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-preview
OpenAI
2024-09-12
GPT-5 Codex
OpenAI
2025-09-15
Performance Metrics
Context window and performance specifications
Average performance across 8 common benchmarks
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GPT-5 Codex
Average Score:9.3%
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o1-preview
Average Score:64.8%(+55.5%)
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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-preview
2 providers
Azure
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GPT-5 Codex
Avg Score:9.3%
Providers:0
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o1-preview
Avg Score:64.8%(+55.5%)
Providers:2