xAIOfficial

xAI: Grok 4 Fast

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...

Pricing

Input

$0.20/1M tokens

Output

$0.50/1M tokens

Cache Read

$0.05/1M tokens

Capabilities

Context Window2.0M tokens

Max Output30K tokens

SpeedFast

Release2025-09

Vision

Tool Use

API Access

Local / Open

API Access

Official API

Official Links

Official Website

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