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GPT-5 Codex vs Grok-4 Heavy
Comprehensive side-by-side LLM comparison
Grok-4 Heavy supports multimodal inputs. 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 4 Heavy was created as a larger, more capable variant of Grok 4, designed to provide maximum reasoning depth and analytical capability. Built for the most demanding applications requiring sophisticated problem-solving, it represents xAI's flagship offering in the fourth generation.
2 months newer
Grok-4 Heavy
xAI
2025-07-09
GPT-5 Codex
OpenAI
2025-09-15
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Knowledge Cutoff
Training data recency comparison
GPT-5 Codex
2024-09-30
Grok-4 Heavy
2024-12-31
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-4 Heavy
0 providers
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GPT-5 Codex
Avg Score:0.0%
Providers:0
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Grok-4 Heavy
Avg Score:0.0%
Providers:0