Grok 4 Fast

xai

xAI's previous-generation fast multimodal model with 2M context and cost-efficient performance. Designed for rapid agentic workflows without extended reasoning.

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Capabilities

Tool Use

Image Input

Image Generation

Example Use Cases

Rapid agentic workflows

Huge context without reasoning

Cost-efficient tool execution

Technical Specifications

Context Window

2,000,000 tokens

Max Output

256,000 tokens

Cache Miss Cost

$0.20 per 1M tokens

Non-Reasoning Cost

$0.50 per 1M tokens

Cache Read Cost

$0.05 per 1M tokens

Web Search Cost

$5 per 1K calls

Code Execution Cost

$5 per 1K calls

Image Generation Cost

$20 per 1K calls

⚠️ Legacy

Made legacy on

Reason

Outdated model

Recommended Replacement

Grok 4.1 Fast