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.
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