Grok-4 Heavy

Grok 4 Heavy is a multi-agent version of Grok 4, released alongside the standard model in summer 2025. The system runs multiple Grok 4 agents in parallel that work independently on tasks and then combine solutions, similar to a study group. Agents share discovered insights and techniques, and the system intelligently combines their work instead of simple majority voting. Uses approximately 10x more compute at test time than regular Grok 4.