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GPT-5 Codex vs Grok-4 Heavy
Comprehensive side-by-side LLM comparison
Grok-4 Heavy leads with 57.5% higher average benchmark score. Grok-4 Heavy supports multimodal inputs. Overall, Grok-4 Heavy 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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xAI
Grok-4 Heavy is a multimodal language model developed by xAI. It achieves strong performance with an average score of 79.5% across 6 benchmarks. It excels particularly in AIME 2025 (100.0%), HMMT25 (96.7%), GPQA (88.4%). As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents xAI's latest advancement in AI technology.
2 months newer
Grok-4 Heavy
xAI
2025-07-09
GPT-5 Codex
OpenAI
2025-09-15
Average performance across 7 common benchmarks
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GPT-5 Codex
Average Score:10.6%
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Grok-4 Heavy
Average Score:68.2%(+57.5%)
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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:10.6%
Providers:0
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Grok-4 Heavy
Avg Score:68.2%(+57.5%)
Providers:0