Grok 4.1 Fast

Published

Nov 19, 2025

Grok 4.1 Fast is an AI model developed by xAI (United States), first published in November 2025. It works in the language domain, on tasks such as language modeling/generation, question answering, mathematical reasoning and 2 more.

Epoch AI has no training-compute estimate for this model.

Access: API access. Its weights are not openly released.

Full record

Organization: xAI
Country of organization: United States
Domain: Language
Task: Language modeling/generation, Question answering, Mathematical reasoning, Quantitative reasoning, Code generation
Model accessibility: API access
Open weights: No