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Physix Frontier · News Briefing Card (IT Home · Oct 16, 2026)

Meta Releases Open-Weight Model Muse Spark Open, 816B Total Params

KEY FACTS

  • Meta released the open-weight model Muse Spark Open on October 15 local time.
  • Meta calls it the most capable US open-weight model to date.
  • The model has 816B total parameters, 42B active parameters, and supports a 1M token context.
  • The model targets code building and agent collaboration, handling long-horizon tasks and multi-step reasoning.
  • The model weights are now available for public download on platforms including Hugging Face.

KEY DATA

816BTotal Parameters
42BActive Parameters
1M tokenContext Window
512 GBLocal Runtime Memory

PHYSIX OBSERVATION

Meta squeezing an 816B-class open-weight model down to run locally on two Mac Studios pulls the open-source race from the cloud back to the desktop. It is a win for developers, but the restrictive commercial terms show Meta still kept a card up its sleeve. The real signal: the open-source large-model battlefield is shifting from parameter scale to on-device deployability.

Source: IT Home report