Muse Spark Open

Muse Spark Open

The most capable US open weights model to date

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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.

Muse Spark Open

Launch date
Muse Spark Open
Muse Spark OpenThe most capable US open weights model to date

Launched on October 16th, 2026