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Muse Spark Open has been benchmarked in Vision Evals. Running it in the Playground and Deploy Now are not available yet. View evals
Muse Spark Open is an open-weight multimodal model released by Meta on October 15, 2026. Its sparse mixture-of-experts architecture has 816 billion total parameters and activates 42 billion per token. It accepts text, images, audio and video, produces text, and supports a context window of 1,048,576 tokens. Meta provides BF16 and NVFP4 checkpoints for self-hosting, alongside access through hosted inference partners.
The model is designed for coding, tool use and multi-step reasoning over long tasks. Its visual inputs support workflows involving screenshots, documents and other image content. Vision Evals measures its text understanding, counting, identification, reasoning and object detection at Low and High effort. The published weights use the custom Muse Model License, with commercial use subject to its terms and the accompanying usage policy.
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Usage
Past 30 DaysNot available
Not in Playground
Muse Spark Open costs $1.25 per 1M input tokens and $4.25 per 1M output tokens.
Pricing updated Oct 27, 2026
Muse Spark Open ships under a custom, model-specific license rather than a standard permissive or restrictive one, so the Muse Spark Open license has to be read directly. Custom model licenses range from effectively permissive to research-only.
Uncertainty around licensing can delay or stop a project, and acceptable-use policies attached to custom licenses are binding terms rather than guidance. Review them alongside the Muse Spark Open license before production deployment.
If the custom terms rule out your use case, a commercial license from the rights holder is the way through. Roboflow's licensing page lists the supported models whose commercial license is included in a Roboflow plan, so it is worth checking whether Muse Spark Open — or a permissively licensed alternative — fits your deployment.
Do not hesitate to reach out with questions for your commercial project — our team will help you start solving business problems on the first call. See Roboflow commercial licensing for the models included in each plan.
Talk to salesMuse Spark Open uses the custom Muse Model License. The weights are available to download, but use remains subject to that license and its accompanying usage policy.
Custom licenses are model-specific. Always check the per-model License Notes section above and the linked official license text.
License information is provided as a guide and is not legal advice.