All Models

xAI: Grok 4.1 Fast

Reasoning Tool Calling Attachments

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using...

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

Benchmarks

23.6
Intelligence Index
19.5
Coding Index
34.3
Math Index

Available Providers (1)

Provider Model ID Input Cost Output Cost Context Max Output Docs
Kilo Gateway x-ai/grok-4.1-fast $0.20/MTok $0.50/MTok 2M 30K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output