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Muse Spark Open targets agentic coding with 1M context and NVFP4 weights

developer.nvidia.com by Tanya Lenz 6 min read Editor score 7/10

Muse Spark Open activates 42B of 816B parameters per token, uses a 1M-token context and NVFP4 checkpoints, and is reported to reach 50K tokens/s per GPU on GB300 NVL72. These figures matter when evaluating large MoE models and hardware for agent serving.

What: Muse Spark Open is an 816B-parameter mixture-of-experts model with 42B active parameters, built for agentic coding.
How: Top-8 routing selects from 256 experts; a 1M-token context and a 1.8B perception encoder support long-codebase and multimodal work.
Why it matters: NVFP4 checkpoints reduce weight memory and can free capacity for larger KV caches and more concurrent long-context sessions.

Token routing activates selected experts in Muse Spark Open. Sketched from the article's own text.

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