At its October 2026 launch, Meta's Muse Spark Open was free to use under the Muse Model License, which requires products to be labeled "Built with Muse Spark Open"

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From the postIntroducing Muse Spark Open, The Most Capable US Open-Weight Model to DateAlso in Muse Spark Open is Meta's answer to Qwen, GLM, and Kimi in the open-weight race

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Introducing Muse Spark Open, The Most Capable US Open-Weight Model to Date

Meta's research blog post launching Muse Spark Open, its 816-billion-parameter open-weight multimodal model, with availability, licence and safety details.

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