Comprehensive side-by-side LLM comparison
Grok-4 Heavy leads with 31.8% higher average benchmark score. GPT-4o is available on 2 providers. Overall, Grok-4 Heavy is the stronger choice for coding tasks.
OpenAI
This updated version of GPT-4o was released with refinements to its multimodal capabilities and improved performance across text, vision, and audio tasks. Built to incorporate learnings from the initial GPT-4o deployment, it enhanced reliability and accuracy while maintaining the seamless cross-modal reasoning that defines the GPT-4o family.
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.
11 months newer

GPT-4o
OpenAI
2024-08-06

Grok-4 Heavy
xAI
2025-07-09
Context window and performance specifications
Average performance across 2 common benchmarks

GPT-4o

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

GPT-4o
Azure
OpenAI


GPT-4o

Grok-4 Heavy

GPT-4o

Grok-4 Heavy
Grok-4 Heavy