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

Meta Releases Open Model Muse Spark Open, Top Model Stays Closed

KEY FACTS

  • Meta released the open-weight model Muse Spark Open on October 15.
  • Meta says the model is the most capable US open-weight model to date.
  • Meta states that Muse Spark Open performs below Muse Wonder, released on Monday.
  • Muse Wonder remains closed-source, and Meta has not published its benchmark scores.
  • Chief AI Officer Wang Tao said that, due to safety and capability boundaries, the very top models are usually not open-sourced.

KEY DATA

30 billionOpen model parameters
Apache 2.0Open-source license

PHYSIX OBSERVATION

Meta keeps its strongest model closed and opens only the next-tier weights, showing that open source has become a strategic tool for it to stake out the ecosystem without ceding the technological high ground. For developers, a strong model is available but not the strongest; for the industry, the trend toward closing off frontier capabilities is further confirmed.

Source: IT Home report