Meta releases the weights of Muse Spark Open, an 816B model with 42B active
TL;DR
- On 15 October Meta released the weights of Muse Spark Open, an 816B-parameter mixture-of-experts model with 42B active per token, a 1M-token context and text, image, video and audio input.
- The Muse Model License lets you use, fine-tune and sell copies free of charge on conditions, among them showing "Built with Muse Spark Open"; a model-as-a-service business over $20 million in revenue needs a separate agreement with Meta.
- Meta's own benchmarks put it at 39 on the Artificial Analysis Intelligence Index against 45 for GLM 5.3, and highest in its table on JobBench and MCP-Atlas.
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