MuseSpark Open
An open-weight large model released by Meta, aimed at coding and long-horizon agentic tasks, with emphasis on the competitiveness of open models from the United States.
Timeline (last 90 days)
Meta released MuseSpark Open, calling it the strongest open-weight model from the US to date, with 816 billion total parameters, 42 billion active parameters, a 1-million-token context window, and aimed at coding and long-horizon agentic tasks.
Artificial Analysis gave MuseSpark Open a score of 39, tied for 17th on the overall leaderboard, 7th among open-source models, about 7 points behind the open-source SOTA, and about 13 points ahead of Nemotron and Inkling.
Meta claims MuseSpark Open achieves open-source SOTA on agentic benchmarks such as JobBench and MCPAtlas.
Open-source model researcher Nathan Lambert said of MuseSpark Open that before this, US models still lagged behind Chinese models, and MuseSpark Open has at least halved the gap.
Apple updated its MLX toolkit to ensure MuseSpark Open runs smoothly on its own hardware, and Zuckerberg posted a video of Muse running on a Mac Studio and thanked Apple's John Ternus.
The full version of the MuseSpark Open model requires 1TB of memory, roughly equivalent to two fully specced M5 Ultra Mac Studios, priced at about $40,000.
All Facts (6)
Meta released MuseSpark Open, calling it the strongest open-weight model from the US to date, with 816 billion total parameters, 42 billion active parameters, a 1-million-token context window, and aimed at coding and long-horizon agentic tasks.
50%UnverifiedArtificial Analysis gave MuseSpark Open a score of 39, tied for 17th on the overall leaderboard, 7th among open-source models, about 7 points behind the open-source SOTA, and about 13 points ahead of Nemotron and Inkling.
50%UnverifiedMeta claims MuseSpark Open achieves open-source SOTA on agentic benchmarks such as JobBench and MCPAtlas.
50%UnverifiedOpen-source model researcher Nathan Lambert said of MuseSpark Open that before this, US models still lagged behind Chinese models, and MuseSpark Open has at least halved the gap.
50%UnverifiedThe full version of the MuseSpark Open model requires 1TB of memory, roughly equivalent to two fully specced M5 Ultra Mac Studios, priced at about $40,000.
50%UnverifiedApple updated its MLX toolkit to ensure MuseSpark Open runs smoothly on its own hardware, and Zuckerberg posted a video of Muse running on a Mac Studio and thanked Apple's John Ternus.
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