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Grok 4 Fast

xAI

Introduction

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

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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 Information

Release Date2025-09-19

Versiongrok4

Try Grok 4 Fast with Lunabot

Grok 4 Fast - AI Model Timeline