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.
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.
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
Context window and performance specifications
Average performance across 3 common benchmarks

Grok-4 Heavy

o3
o3
2024-05-31
Grok-4 Heavy
2024-12-31
Available providers and their performance metrics

Grok-4 Heavy

o3
OpenAI

Grok-4 Heavy

o3

Grok-4 Heavy

o3