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Grok-4 Heavy vs o3
Comprehensive side-by-side LLM comparison
Grok-4 Heavy leads with 16.4% higher average benchmark score. Overall, Grok-4 Heavy is the stronger choice for coding tasks.
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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.
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OpenAI
o3 represents the next generation in OpenAI's reasoning model series, developed to advance the capabilities of deliberate, step-by-step problem solving. Built to handle increasingly complex challenges across mathematics, science, and coding, it continues the evolution of reasoning-focused AI with improved analytical depth and accuracy.
2 months newer
o3
OpenAI
2025-04-16
Grok-4 Heavy
xAI
2025-07-09
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Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Grok-4 Heavy
Average Score:79.7%(+16.4%)
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o3
Average Score:63.3%
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Knowledge Cutoff
Training data recency comparison
o3
2024-05-31
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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Grok-4 Heavy
0 providers
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o3
1 providers
OpenAI
Throughput:
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Grok-4 Heavy
Avg Score:79.7%(+16.4%)
Providers:0
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o3
Avg Score:63.3%
Providers:1