Meta

Muse Spark Open

Commercial

Open-weight multimodal model with 816 billion total parameters, 42 billion active, and a 1 million-token context window. Meta released the weights on Oct. 15, 2026 under the Muse Model License with limited commercial terms, and says it runs on two Apple M5 Ultra Mac Studios.

Latest update Oct 15, 2026

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Current status

Weights released Oct. 15, 2026. Distinct from proprietary Muse Wonder.

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In the news1

  1. Meta releases Muse Spark Open weights for Mac Studio

    Meta on Oct. 15 released weights for Muse Spark Open, an open multimodal model with 816 billion total parameters, 42 billion active, and a 1 million-token context, under a license with limited commercial terms. Meta says the model runs on two Apple M5 Ultra Mac Studios using MLX. CNBC reported that Apple and Meta worked on the release and quoted posts from Mark Zuckerberg and Apple CEO John Ternus.

    research.meta.ai www.cnbc.com + Apple Inc.

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