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Grok 4 Fast Reasoning

xai

xAI's previous-generation thinking model with 2M context and cost-efficient agentic performance. Combined rapid execution with reasoning capabilities.

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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

$0.2 per 1M tokens

Output Cost

$0.5 per 1M tokens

File Input Limit

20 files

Files in Assistant Messages

Yes

⚠️ Deprecated

Deprecated on

Reason

Outdated model

Recommended Replacement

Grok 4.1 Fast Reasoning

Availability

No account required

$0 per month

Also available in these plans

Free
Free
Plus
$20/mo
Pro
$100/mo
Super
$200/mo