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GPT-5 Codex vs o1-preview
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 33.2% higher average benchmark score. o1-preview 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
o1-preview was introduced as an early version of OpenAI's reasoning model series, designed to demonstrate the potential of AI models that engage in extended thinking before responding. Built to solve complex problems through deliberate reasoning processes, it represented an initial step toward more thoughtful and analytical AI systems.
1 year newer
o1-preview
OpenAI
2024-09-12
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%(+33.2%)
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o1-preview
Average Score:41.3%
Performance comparison across key benchmark categories
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GPT-5 Codex
Coding74.5%(+33.2%)
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o1-preview
Coding41.3%
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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:74.5%(+33.2%)
Providers:0
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o1-preview
Avg Score:41.3%
Providers:2