Muse Spark Open: 816B parámetros abiertos de Meta

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Meta launched Muse Spark Open on October 15, 2026, as the most capable U.S. open-weight model. This mixture-of-experts model features 816 billion total parameters, with 42B active per token, and a 1 million token context window for agentic work and software engineering. While weights are free to download, local execution requires approximately one terabyte of RAM. It can run fully on two Mac Studio devices equipped with M5 Ultra chips without cloud servers.
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