Changes from previous version
Uses additional test-time compute versus standard Grok 4 for tougher multi-step problems while sharing the same July 2025 launch window.
Release Summary
Higher-compute Grok 4 variant aimed at the hardest reasoning, math, and agentic workloads in the Grok 4 generation.
Timeline
July 9, 2025
Grok 4 Heavy released
xAI ships Grok 4 Heavy alongside the standard Grok 4 model.