What the evidence says
- Developer
- xAI
- Released
- July 10, 2025
- Domains
- Language
- Tasks
- Language modeling/generation · Question answering · Mathematical reasoning · Quantitative reasoning · Code generation
- Access
- Unreleased
- Weights
- Closed weights
Common questions
What is Grok 4 Heavy?
Grok 4 Heavy is a xAI model released July 10, 2025, according to Epoch AI's reviewed catalog record. The record classifies it under language.
How does Grok 4 Heavy rank on LMArena?
No board Model Gauntlet mirrors currently lists this exact model revision under a reviewed identity, so no rating is reported here.
What does Grok 4 Heavy cost?
No reviewed source carries pricing for this record, so no price is reported here.