xAI

Grok 4.1 Fast Reasoning

xAI•Documentation

grok-4-1-fast-reasoning

xAI's fast reasoning model. Balances depth with low latency for production reasoning workloads. Supports X search and web search. 256K context.

Use this model with Aisle

Have natural conversations with the model in a familiar interface

Automate tasks, share with your team, and deploy to chat

Test prompt variants, model settings, and compare models side by side

Chain prompts together for complex automation and outcomes

Context Window

256K

tokens

Max Output

131,072

tokens

Temperature

0 – 2

default: 1

Web Search

Available

Structured Output

Available

Supported File Formats

Images

JPEG(20 MB)PNG(20 MB)

Documents

pdftextdocxlsrtfdocxxlsxpptxpptodtodpods

Grok models require documents to be uploaded to xAI's Files API before use in chat. Files are stored for up to 30 days and are not used for model training under xAI's Enterprise API terms. xAI Privacy Policy