Release: Meta publishes Muse Spark Open under the Muse Model License, with attribution and a revenue-based Model as a Service agreement requirement.
Meta, Muse Spark Open LICENSE.md (primary source, opens in a new tab)
Details
On open weights
including the model, code, model weights, parameters, configuration files, and associated documentation files
The file gives a release date of October 15, 2026. Section 3 applies above $20 million aggregate gross revenue over any consecutive 12 months for Model as a Service providers. Section 2 requires Built with Muse Spark Open attribution and defines derivatives to include models improved using outputs. The attached usage policy is incorporated into the license.
- License
- MUSE MODEL LICENSE (opens in a new tab)
- Commercial use
If the Licensee or any of its affiliates provide a third party with access to artificial intelligence models as a product or service, via API or a similar interface, where the third party receives outputs of such models (“Model as a Service”), and the aggregate gross revenue of the Licensee and its affiliates exceeds twenty (20) million US dollars (or the equivalent in other currencies) during any consecutive twelve (12) month period, the Licensee must notify Meta and enter into a separate written agreement with Meta before offering the Software or any Derivatives as part of that Model as a Service business.
- Weights
- Downloadable
- Previous license
- None recorded
- Source type
- License file
- Checked
- Entry
- #2026-10-15-muse-spark-open-license