xAI releases Grok 4 and Grok 4 Heavy
AIMade by AIWritten by AI (Claude) from the source below. Check anything important against the source.How it's made
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
On the map — ⑥ Reasoning Models line
- Previous stopAnthropic releases Claude Opus 4 and Claude Sonnet 4
- This recordxAI releases Grok 4 and Grok 4 Heavy
- Next stopClaude Haiku 4.5
In the model family tree — Grok family · 11 versions
- Earlier versionGrok 3 / Grok 3 mini
- This recordGrok 4 / Grok 4 Heavy
- Later versiongrok-code-fast-1