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Grok 4 Fast

Chat

xAI

x-ai/grok-4-fast

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. Read more about the model...

99

credits / gen

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File Support Reasoning 2000K Context Vision (OR)

About this model

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. Read more about the model...

Technical Specifications

Provider

xAI

Type

Chat

Context Window

2,000,000 tokens

Pricing

99 credits

Knowledge Cutoff

2025-09-30

Capabilities

File Support

Can read PDF, DOCX, XLSX & more

Reasoning

Chain-of-thought reasoning exposed

2000K Context

Large context window for long documents

Vision (OR)

OpenRouter reports vision support