Meta AI / Meta Developer Blog
Meta releases Muse Spark Open
2026-10-15
Meta published Muse Spark Open, an open-weight 816B-parameter mixture-of-experts model that activates ~42B parameters per token, accepts text, image, video and audio input, and supports a 1 million‑token context window; Meta says the weights and runtime support are available for deployment, including optimizations for Mac Studio.
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