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    Announcement

    Muse Spark Open weights released October 15, 2026

    finkd says the model runs well on new Mac Studios, crediting work with Apple and John Ternus.

    Thomas WolfTW
    AI at MetaAA
    Alexandr WangAW
    61 Sources, 1h ago, first seen 1h ago

    TLDR

    On October 15, finkd said Muse Spark Open’s weights were releasing that day and that the model ran well on new Mac Studios thanks to work with Apple and John Ternus. Meta says the weights are available for download and lists 816 billion total parameters, 42 billion active parameters, a 1 million-token context and native multimodal capabilities. It says the model was built for coding and agentic work.

    Combined views

    943.1K

    61 Sources, first seen 1h ago

    21.2K likes1.1K comments2.7K saves1.5K reposts

    Combined views

    943.1K

    61 Sources, first seen 1h ago

    21.2K likes1.1K comments2.7K saves1.5K reposts
    Image: @finkd on X

    Meta released the weights for Muse Spark Open on Oct. 15, 2026, describing it as a model built for coding and AI agents that carry out extended tasks. In its launch announcement, the company lists 816 billion total parameters, 42 billion active parameters and a context window of 1 million tokens. Its AI at Meta account says the model handles text, images, video and audio.

    Featured Source

    The local-computing setup is specific: Meta says Muse Spark Open is optimized to run on two Apple M5 Ultra Mac Studios using the latest MLX framework. Mark Zuckerberg, posting as finkd, credited work with Apple and John Ternus for the model's performance on the new machines. That is Meta's launch claim, not an independent performance test.

    Developers can also use hosted APIs. Meta lists Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter and Together AI as providers. It says downloadable weights are available through Amazon SageMaker AI, Google Cloud Model Garden, Hugging Face and Microsoft Foundry Models.

    Open weights come with conditions. Meta says it is releasing them under the Muse Model License with limited commercial terms, which allow many developers to use the model for free.

    Sentiment

    Positive65.4%34.6%Negative

    Summary

    Many accounts welcomed Muse Spark Open's open weights release for its coding capabilities and Mac Studio integration, while others called it a nerfed or watered-down model with lingering rate-limit problems.

    Based on 561 sentiment-bearing replies from 498 accounts across 4 conversations.

    Useful links

    Hugging Face

    Welcome Muse Spark Open: open-weight frontier multimodal mixture-of-experts model from Meta

    developers.meta.com

    Meta Connect 2026: The end-to-end recap

    Sentiment

    Positive65.4%34.6%Negative

    Summary

    Many accounts welcomed Muse Spark Open's open weights release for its coding capabilities and Mac Studio integration, while others called it a nerfed or watered-down model with lingering rate-limit problems.

    Based on 561 sentiment-bearing replies from 498 accounts across 4 conversations.

    Useful Links

    Hugging Face

    Welcome Muse Spark Open: open-weight frontier multimodal mixture-of-experts model from Meta

    developers.meta.com

    Meta Connect 2026: The end-to-end recap

    Useful Links

    Hugging Face

    Welcome Muse Spark Open: open-weight frontier multimodal mixture-of-experts model from Meta

    developers.meta.com

    Meta Connect 2026: The end-to-end recap

    62 Sources

    Meta AI ResearchIntroducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date18h
    Mark Zuckerberg@finkdMuse Spark Open -- weights releasing today -- runs great on new Mac Studios thanks to work with @johnternus and Apple.1h
    Alexandr Wang@alexandr_wangmuse spark open -- weights out today! best US open-source model, and runs on the new mac studio 🍎1h
    AI at Meta@AIatMetaToday we’re releasing Muse Spark Open, the most capable US open-weight model to date. Built for coding and agentic work, it excels at long-horizon tasks, complex software engineering, and multi-step reasoning. Key Model Specs: → 816B total / 42B active parameters → 1M token context window → Natively multimodal across text, image, video, audio1h
    Evan@StockMKTNewzAPPLE $AAPL AND META $META ARE TEAMING UP TO RUN META'S NEW AI MODEL ON MACS Developers can run Meta's Muse Spark Open model on 2 to 4 linked Mac Studios, per CNBC. It's the first public partnership between Apple and Meta since 2017.1h
    Victor M@victormustarAlert: Meta just released Muse Spark its new open weights model on Hugging Face 🚨 https://huggingface.co/collections/meta-models/muse-spark-open1h
    Delip Rao@delipraoMeta is making history1h
    Hitbear@hitborg$AAPL and $META are partnering so Meta’s Muse Spark Open model can run locally on high-end Mac computers. The setup uses Apple’s MLX framework and is optimized for M5 Ultra Mac Studios. It points to rising interest in on-device AI over pure cloud reliance. Whether this stays limited to premium hardware is still unclear.1h
    Ravid Shwartz Ziv@ziv_ravidMuse Spark Open 💪1h
    Shuchao Bi@shuchaobiIt is a really good open-weights model1h
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    Muse Spark

    62 Sources

    Meta AI ResearchIntroducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date18h
    Mark Zuckerberg@finkdMuse Spark Open -- weights releasing today -- runs great on new Mac Studios thanks to work with @johnternus and Apple.1h
    Alexandr Wang@alexandr_wangmuse spark open -- weights out today! best US open-source model, and runs on the new mac studio 🍎1h
    AI at Meta@AIatMetaToday we’re releasing Muse Spark Open, the most capable US open-weight model to date. Built for coding and agentic work, it excels at long-horizon tasks, complex software engineering, and multi-step reasoning. Key Model Specs: → 816B total / 42B active parameters → 1M token context window → Natively multimodal across text, image, video, audio1h
    Evan@StockMKTNewzAPPLE $AAPL AND META $META ARE TEAMING UP TO RUN META'S NEW AI MODEL ON MACS Developers can run Meta's Muse Spark Open model on 2 to 4 linked Mac Studios, per CNBC. It's the first public partnership between Apple and Meta since 2017.1h
    Victor M@victormustarAlert: Meta just released Muse Spark its new open weights model on Hugging Face 🚨 https://huggingface.co/collections/meta-models/muse-spark-open1h
    Delip Rao@delipraoMeta is making history1h
    Hitbear@hitborg$AAPL and $META are partnering so Meta’s Muse Spark Open model can run locally on high-end Mac computers. The setup uses Apple’s MLX framework and is optimized for M5 Ultra Mac Studios. It points to rising interest in on-device AI over pure cloud reliance. Whether this stays limited to premium hardware is still unclear.1h
    Ravid Shwartz Ziv@ziv_ravidMuse Spark Open 💪1h
    Shuchao Bi@shuchaobiIt is a really good open-weights model1h
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