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Meta releases 816B Muse Spark Open model for agents, with usage restrictions

By PulseAugur Editorial · [1 sources] ·

Meta has released Muse Spark Open, an 816 billion parameter model with 42 billion active parameters, designed for agentic tasks and coding. The model boasts a 1 million token context window and native multimodality, with Meta claiming it is the most capable US open-weight model to date. While it excels in tool calling, its performance on raw coding and general intelligence benchmarks lags behind some Chinese frontier models. The Muse Model License restricts commercial use for services exceeding $20 million in annual revenue without a separate agreement, distinguishing it from traditional open-source licenses. AI

IMPACT This model is a strong contender for agentic applications, particularly for developers seeking non-Chinese open-weight options, though its licensing may restrict large-scale commercial services.

RANK_REASON Frontier-lab model release with system card and detailed technical/licensing information. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Meta releases 816B Muse Spark Open model for agents, with usage restrictions

How we ranked this

Signal score
62 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
Frontier-lab model release with system card and detailed technical/licensing information. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, product
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AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
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Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Ashraf ·

    Meta Just Open-Weighted an 816B Model. Here's What the Fine Print Actually Says

    <p>Meta dropped the weights for <strong>Muse Spark Open</strong> on October 15, and it's sitting at ~800 points on Hacker News. Most of the takes are either "Meta is back" or "that's not open source." Both are lazy. Let's look at what you actually get.</p> <h2> The spec sheet </h…

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