Grok 4 Fast Reasoning

xai

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.

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Capabilities

Tool Use

Extended Thinking

Image Input

Technical Specifications

Context Window

2,000,000 tokens

Max Output

256,000 tokens

Input Cost

$0.20 per 1M tokens

Output Cost

$0.50 per 1M tokens

File Input Limit

20 files

Files in Assistant Messages

Yes

Availability

Free

Minimum plan required

$0 per month

Also available in these plans

Plus

$20/mo

Pro

$100/mo

Super

$200/mo