Meta releases 816B parameter Muse Spark Open model with custom license
ByPulseAugur Editorial·[10 sources]·
Meta has released Muse Spark Open, an 816-billion-parameter mixture-of-experts model, with approximately 42 billion parameters active per token for efficiency. This model, designed for coding and agentic tasks with a 1M-token context window, scores 39 on the Artificial Analysis Intelligence Index, positioning it as the top-scoring US-built open-weight model. However, its release under a custom Muse Model License, rather than standard open-source licenses like Apache 2.0 or MIT, includes attribution requirements and a $20 million revenue threshold for separate agreements with Meta.
AI
IMPACT
Accelerates development of AI agents and coding tools by providing a powerful, albeit restrictively licensed, open-weight model.
RANK_REASON
Frontier-lab model release with system card and custom license terms.
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<p>Meta just did something it hasn't done in over two years: it released the weights of a frontier-class model. <strong>Muse Spark Open</strong>, launched October 15, 2026 by Meta Superintelligence Labs, is an 816-billion-parameter mixture-of-experts model — but only about 42 bil…
