Meta releases Muse Spark Open, a model with 816B parameters
A company must sign an agreement with Meta before it sells the model as a service if its revenue is more than $20 million in 12 months.
Meta has released Muse Spark Open, an open-weight model with 816B parameters. Of these, 42B are active. Meta says it is the most capable US open-weight model to date. In tests by Meta, its score is above that of Kimi K3, GLM 5.3 and Qwen3.8 on agent benchmarks. On Terminal-Bench 2.1, it has 76.4 and Kimi K3 has 85.0.
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