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Meta releases Muse Spark Open weights, 816B parameters with 42B active
Meta says it released the weights of Muse Spark Open on Hugging Face under the Muse Model License. The model has 816B total and 42B active parameters, a 1M-token context and native image, audio and text input, and is tuned for agentic coding. Meta reports 1.03 to 3.95x kernel speedups from Helion kernels. Claims are Meta's own.
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Tuesday, October 20, 2026