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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 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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xAI
Grok Code Fast was developed as a specialized coding model optimized for speed, designed to provide rapid code completion, generation, and assistance. Built to serve developers requiring quick feedback and iterative coding support, it combines programming expertise with low-latency responses.
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%
Performance comparison across key benchmark categories
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GPT-5 Codex
Coding74.5%(+3.7%)
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Grok Code Fast 1
Coding70.8%
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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