Meta releases Muse Spark Open, an 816B-parameter open-weights model

The Hugging Face model card lists 816B total and 42B active parameters with a 1M-token context, released Oct 15 under the Muse Model License. Access requires an identity form.

Benchmarks are the company's own; not independently verified.

Why it matters

A near-frontier open model lowers the cost of building differentiated features without a vendor API.

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