Skip to content
  12.  
    13. © 2023 – 2025 OpenRouter, Inc

    xAI: Grok 4 Fast

    x-ai/grok-4-fast

    Created Sep 19, 20252,000,000 context
    Starting at $0.20/M input tokensStarting at $0.50/M output tokens

    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 on xAI's news post. Reasoning can be enabled using the reasoning enabled parameter in the API. Learn more in our docs

    Recent activity on Grok 4 Fast

    Total usage per day on OpenRouter