Meta opens the 816B-parameter Muse Spark Open model
Meta released BF16 and NVFP4 weights for Muse Spark Open, a coding-oriented multimodal mixture-of-experts model with roughly 816B total and 42B active parameters, text, image, audio and video inputs, text output and up to one million tokens of shared context; AWS added both variants to SageMaker JumpStart.
Why it matters: Open weights and multiple runtime paths make a very large multimodal coding model inspectable and deployable outside one hosted API. Its scale, license and output of reasoning traces make hardware cost, data handling and trace exposure part of the adoption…