Muse Spark Open releases with 816B total and 42B active parameters, a 1M-token context and MLX support for clustered M5 Ultra Mac Studios; weights carry Meta’s limited-commercial licence.

Apple’s official Mac Studio product image; Muse Spark Open supports clustered M5 Ultra Mac Studios through MLX.

Published 16 Oct 2026 · 01:29 UTC

Meta AI Research ↗ · Source dated 15 Oct 2026

Muse Spark Open releases with 816B total and 42B active parameters, a 1M-token context and MLX support for clustered M5 Ultra Mac Studios; weights carry Meta’s limited-commercial licence. · ournews.ai