What the evidence says
- Developer
- xAI
- Released
- November 19, 2025
- Domains
- Language
- Tasks
- Language modeling/generation · Question answering · Mathematical reasoning · Quantitative reasoning · Code generation
- Access
- API access
- Weights
- Closed weights
Common questions
What is Grok 4.1 Fast?
Grok 4.1 Fast is a xAI model released November 19, 2025, according to Epoch AI's reviewed catalog record. The record classifies it under language.
How does Grok 4.1 Fast rank on LMArena?
No board Model Gauntlet mirrors currently lists this exact model revision under a reviewed identity, so no rating is reported here.
What does Grok 4.1 Fast cost?
No reviewed source carries pricing for this record, so no price is reported here.