Grok 4 Fast

xAI

Introduction

Grok 4 Fast is an AI model developed by xAI. It supports Chat, Vision, Code capabilities.

2,000,000 tokens

220 tokens/s

24000 tokens/s

Chat

Vision

Code

Input Tokens2,000,000 tokens

Output Tokens128,000 tokens

$0.0002/1K input, $0.0005/1K output

Release Date2025-09-19

Versiongrok4