All Models

Grok 4 Fast

Reasoning Tool Calling Attachments

Fast Grok model for responsive chat, reasoning, and tool-assisted work

Providers 1
Released Sep 19, 2025
Input Modalities text, image
Output Modalities text
Tarsk Use coding

Benchmarks

16.6
Intelligence Index
41.3
Math Index

Available Providers (1)

Provider Model ID Input Cost Output Cost Context Max Output Docs
ZenMux x-ai/grok-4-fast $0.20/MTok $0.50/MTok 2M 64K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output