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GPT-5 Codex vs Grok Code Fast 1
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 3.7% higher average benchmark score. Both models have their strengths depending on your specific coding needs.
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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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xAI
Grok Code Fast 1 is a language model developed by xAI. It achieves strong performance with an average score of 70.8% across 1 benchmarks. Notable strengths include SWE-Bench Verified (70.8%). It supports a 266K token context window for handling large documents. The model is available through 1 API provider. Released in 2025, it represents xAI's latest advancement in AI technology.
18 days newer
Grok Code Fast 1
xAI
2025-08-28
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%(+3.7%)
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Grok Code Fast 1
Average Score:70.8%
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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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Grok Code Fast 1
1 providers
xAI
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GPT-5 Codex
Avg Score:74.5%(+3.7%)
Providers:0
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Grok Code Fast 1
Avg Score:70.8%
Providers:1