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Muse Spark Open narrows the gap for US open-weight models

interconnects.ai by Nathan Lambert 9 min read Editor score 7/10

The analysis says Muse Spark Open and Reflection’s Beam shift the standing of US open-weight models, with Mistral Large 4 also entering the comparison. Model builders get a timely view of the changing open-model landscape, though the excerpt gives only high-level comparisons.

What

Muse Spark Open is described as the strongest American-made open model, bringing open weights back closer to frontier performance.

How

The author places it above GLM 5.2, near DeepSeek V4.1 Flash, and behind GLM 5.3 or Kimi K3.

Why it matters

Growing demand for open models is driving inference providers, post-training work, and enterprises seeking to own their intelligence.

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