Meta releases Muse Spark Open open-weight model

Meta released Muse Spark Open, calling it the most capable US open-weight model to date, built for coding and agentic work. It has 816B total/42B active parameters, a 1M-token context window, text/image/video/audio modalities, and is optimized for Apple M5 Ultra silicon, with weights on Hugging Face and other platforms.

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