Checked fact 161416 Oct 2026Models and releases

Muse Spark Open is a mixture-of-experts transformer with 256 experts, of which 8 are active per token.

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The exact words it rests on

Mixture-of-Experts Transformer, with Perception Encoder ... Number of Experts: 256 ... Experts Activated per Token: 8 (top-k routing)

What the source said when we opened it, on 16 Oct 2026.

The source

Muse Spark Open model card
Meta · 2026-10-15

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Checked

Checked by the notis newsroom on 16 Oct 2026, against the source above.

In the story

Meta releases open-weight Muse Spark Open under its own licence 16 Oct 2026

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In a sentence

“Muse Spark Open is a mixture-of-experts transformer with 256 experts, of which 8 are active per token.” ai notis, checked 16 Oct 2026. Source: Muse Spark Open model card (Meta). https://ainotis.com/c/1614

As a reference (APA style)

ai notis. (2026, October 16). Muse Spark Open is a mixture-of-experts transformer with 256 experts, of which 8 are active per token [Checked claim 1614]. ai notis. https://ainotis.com/c/1614

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