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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

Image Generation

Example Use Cases

Agentic workflow with reasoning

Huge context with thinking

Rapid intelligent agents

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Outdated model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 Reasoning