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 reasoningenabled parameter in the API. Learn more in our docs
Prompts and completions on Grok 4 Fast Free may be used by xAI or OpenRouter to improve future models.
Grok 4 Fast - API, Providers, Stats | OpenRouter
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
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Apps using Grok 4 Fast
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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.