Meta partners with Apple to run 816B parameter Muse Spark Open locally on Macs

Meta's 816 billion parameter open-weight model can run on two M5 Ultra Mac Studios without touching the cloud Apple and Meta are collaborating so that Meta’s Muse AI model can run directly on Mac computers. The model at the center of the partnership is Muse Spark Open, which Meta unveiled on October 15, 2026. Meta presents it as the most advanced open-weight AI model built in the United States. It can run entirely on Apple hardware, with no cloud server involved. Start with size. Muse Spark Open carries 816 billion parameters , and 42 billion of them are active at any given time. The model is natively multimodal, so it was built from the start to handle more than plain text.

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