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Meta releases Muse Spark Open, saying it is the most capable US open-weight model, with 816B total and 42B active parameters and a 1M-token context window (Meta AI Research)

This story is from 2026-10-13. It is preserved in the archive; the latest stories are on the live feed.

Meta AI Research : Meta releases Muse Spark Open, saying it is the most capable US open-weight model, with 816B total and 42B active parameters and a 1M-token context window Muse Spark Open is available today and brings leading agentic capabilities to your desktop for the first time on Apple M5 Ult…

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Timeline · 3 reports

  1. 2026-10-15 17:10 · Techmeme
    Meta releases Muse Spark Open, saying it is the most capable US open-weight model, with 816B total and 42B active parameters and a 1M-token context window (Meta AI Research)
  2. 2026-10-15 17:00 · The New Stack AI
    Meta ships Muse Spark Open, its answer to China’s open-weight models
  3. 2026-10-13 23:35 · r/LocalLLaMA
    Muse Spark open weights reaffirmed

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  1. Meta Releases Muse Spark Open, an 816B Open-Weight Model for Coding — AWS Machine Learning Blog
  2. "Mommy and daddy" play nice: Apple and Meta team up to bring open-source Muse to Macs — Axios AI+
  3. Meta and Apple, Longtime Foes, Team Up to Put Open-Weight AI on Macs — Wall Street Journal Technology
  4. Alexandr Wang says ex-Apple exec Daniel Gross, now at Meta, helped bring Meta and Apple together: "we're excited for mommy and daddy to be playing nice again" — Techmeme
  5. Meta Releases Open AI Model While Keeping Its Best Tech Closed — Bloomberg AI
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