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

Technical Specifications

Context Window

2,000,000 tokens

Max Output

256,000 tokens

Input Cost

$0.2 per 1M tokens

Output Cost

$0.5 per 1M tokens

File Input Limit

20 files

Files in Assistant Messages

Yes

⚠️ Deprecated

Deprecated on November 20, 2025

Reason

Outdated model

Recommended Replacement

Grok 4.1 Fast

Availability

No account required

$0 per month

Also available in these plans

Free

Plus

$20/mo

Pro

$100/mo

Super

$200/mo