Meta has unveiled Muse Spark Open, an 816B-parameter open-weight multimodal model optimized for the M5 Ultra Mac Studio. The model supports on-device agentic coding and reasoning workflows through Apple’s MLX framework.

Meta states the model excels at long-horizon tasks, complex software engineering, and multi-step reasoning.
https://x.com/finkd/status/2110778025629347999
The company says two Mac Studios with M5 Ultra chips together provide a terabyte of unified memory and 1.2 TB/s bandwidth per machine, allowing the full model to run locally.
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