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/disabled using the reasoning enabled parameter in the API. Learn more in our docs

    Providers for Grok 4 Fast

    OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

    Performance for Grok 4 Fast

    Compare different providers across OpenRouter

    Apps using Grok 4 Fast

    Top public apps this week using this model

    Recent activity on Grok 4 Fast

    Total usage per day on OpenRouter

    Uptime stats for Grok 4 Fast

    Uptime stats for Grok 4 Fast across all providers

    Sample code and API for Grok 4 Fast

    OpenRouter normalizes requests and responses across providers for you.

    OpenRouter provides an OpenAI-compatible completion API to 400+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

    In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

    Using third-party SDKs

    For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

    See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.