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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

2M

Released

Sep 5, 2025

ActivityFAQ

Activity

Token volume and request traffic to this model over time.

About Sonoma Sky Alpha

OpenRouter makes Sonoma Sky Alpha by OpenRouter available through a unified, OpenAI-compatible API using the model ID openrouter/sonoma-sky-alpha.

Sonoma Sky Alpha accepts text and images and returns text. It has a 2,000,000-token context window.

It was released on September 5, 2025.

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.