Model
Grok 4.1
by xAI (Grok)
Family
Grok
Context window
2,000,000 tokens
Open weights
No
Release date
2025-11-17
Benchmark notes
Reached 1483 Elo on LMArena Text Arena at launch; reported ~65% reduction in hallucinations (12.09% → 4.22%) versus prior Grok versions; Grok 4.1 Fast variant supports Agent Tools API.