xAI releases Grok 4 and Grok 4 Heavy
Grok 4 and Grok 4 Heavy released — 50.7% on the HLE text-only subset (Heavy), 15.9% on ARC-AGI V2. RL with more than 10 times the previous compute on a 200,000-GPU cluster
Why it matters
An approach that raised RL compute to pretraining levels. All cited scores come from xAI's announcement, and no independent party checking them is named
Source — Primary sources first; secondary reports are labelled “Press”
Officialx.aihttps://x.ai/news/grok-4Added in Week 35, 2026 · See that week