Grok 4 Heavy

Published

Jul 10, 2025

Grok 4 Heavy is an AI model developed by xAI (United States), first published in July 2025. It works in the language domain, on tasks such as language modeling/generation, question answering, mathematical reasoning and 2 more.

Epoch AI has no training-compute estimate for this model.

Access: Unreleased. Its weights are not openly released.

Full record

Organization: xAI
Country of organization: United States
Domain: Language
Task: Language modeling/generation, Question answering, Mathematical reasoning, Quantitative reasoning, Code generation
Model accessibility: Unreleased
Open weights: No