grok-4.1-fast-reasoning Preview

reasoning

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Infrastructure
Streaming

Details

Model IDgrok-4.1-fast-reasoning
Provider Azure AI Foundry
Creator xAI
Familygrok-4.1
License—
Status—
Typereasoning
Input modalitiestext, image
Output modalitiestext
Open weight—
Parameters—
Architecture—
Context window—
Max input—
Max output—
Reasoning tokens—
Knowledge cutoff—
Release date—
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Family Comparison: grok-4.1

ModelContextMax out
grok-4.1-fast-non-reasoning Preview——
grok-4.1-fast-reasoning Preview——

API

GET/v1/models/azure/grok-4.1-fast-reasoning