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RELEASE Muse Spark Is Now an Open-Weights Model

Today, Meta is releasing the weights for Muse Spark Open, the most capable US open-weights model to date.

Source tier 1: +40
Category RELEASE: +30
Other adjustment (same-source burst decay, or scored under an earlier weighting): −5
Base score: 65
Velocity (0 corroborating sources): +0
Model mention: not accelerating vs. the prior week, no velocity bonus
Age decay (29d since published): −65
Effective score right now: 0