Muse Spark Open

Muse Spark Open

The most capable US open weights model to date

Developer ToolsOpen Source
▲ 64 votes1 commentsLaunched Oct 16, 2026
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Meta's open weights model built for coding and agentic work. 816B total parameters with 42B active, a 1M token context window and native multimodal input. Download the weights on Hugging Face or run it on two M5 Ultra Mac Studios with MLX.

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