Meta released Muse Spark Open under an open license. The license allows free use, modification, and distribution of the model and its derivatives. Users must include Meta’s copyright notice and Usage Policy in all copies. Any product or service using the model must display 'Built with Muse Spark Open'. Model as a Service providers earning over $20M annually must notify Meta and sign a separate agreement. Meta disclaims ownership of outputs generated by the model. The license includes a detailed Usage Policy prohibiting illegal, harmful, or deceptive uses. The policy also bans high-risk applications like military, weapons, or critical infrastructure operations. Meta provides the model on an 'as is' basis with no warranties.
What changed
No prior open license for Muse Spark Open existed.
What it unlocks
Using, modifying, and distributing Muse Spark Open under an open license with usage policy and attribution requirements.
- $20M annual revenue threshold for Model as a Service notification
- October 15, 2026 release date
What you need to act on it
- compliance with Usage Policy
- attribution in UI or documentation
- notification to Meta for Model as a Service businesses exceeding $20M annual revenue
Sources