All Models

X-Ai/Grok 4.1 Fast Reasoning

Reasoning Tool Calling Attachments
Providers 1
Released Dec 19, 2025
Input Modalities text, image, audio, video
Output Modalities text
Tarsk Use coding

Benchmarks

38.6
Intelligence Index
30.9
Coding Index
89.3
Math Index

Available Providers (1)

Provider Model ID Input Cost Output Cost Context Max Output Docs
Qiniu x-ai/grok-4.1-fast-reasoning —/MTok —/MTok 20M 2M

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output