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Sonoma Sky Alpha were early test versions of Grok 4 Fast, which is free to use for a limited time.”

All prompts and completions for this model are logged by the provider and may be used to improve the model.

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Sonoma Sky Alpha

openrouter/sonoma-sky-alpha

This is a cloaked model provided to the community to gather feedback. A maximally intelligent general-purpose frontier model with a 2 million token context window. Supports image inputs and parallel tool calling.

Note: It’s free to use during this testing period, and prompts and completions are logged by the model creator for feedback and training.

Modalities
Context
2.0M
Released
Sep 5, 2025
ActivityFAQExplore

Activity

Token volume and request traffic to this model over time.

Not currently available through EU in-region routing. In-region routing docs

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Frequently asked questions

This is a cloaked model provided to the community to gather feedback. A maximally intelligent general-purpose frontier model with a 2 million token context window. Supports image inputs and parallel tool calling. Note: It’s free to use during this testing period, and prompts and completions are logged by the model creator for feedback and training.

Sonoma Sky Alpha has a 2,000,000 token context window.

Sonoma Sky Alpha accepts text and images as input and returns text.

Sonoma Sky Alpha was released on September 5, 2025.