Meta 发布开源权重模型 Muse Spark Open，816B 参数、支持百万 token 上下文
Muse Spark Open is Meta's answer to Qwen, GLM, and Kimi in the open-weight race
Meta 发布开源权重模型 Muse Spark Open，称其为美国最强的开源权重模型，面向编码与智能体任务，拥有 8160 亿参数（激活 420 亿）、最高 100 万 token 上下文，支持文本、图像、视频和音频。Meta 称其在 JobBench、MCP-Atlas、HLE-Diamond、ZeroBench 等基准上多个类别领先 Qwen 3.8、GLM 5.3 和 Kimi K3，但仍明显落后于 Meta 付费的 Muse Wonder Full 模型。该模型针对 Apple M5 Ultra 优化，可在两台各配 512 GB 统一内存的 Mac Studio 上本地运行，权重已发布在 Hugging Face；许可免费使用但需标注 Built with Muse Spark Open，年收入超过 2000 万美元且想以 API 形式提供该模型的服务商需与 Meta 另行签约。
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Meta 时隔 Llama 系列后重回开源权重赛道，读者可据此了解其参数规模、上下文长度与许可限制。
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After its Llama series, Meta is returning to open-weight territory with Muse Spark Open. Meta calls it the most capable US open-weight model, built for coding and agentic tasks, with 816 billion parameters (42 billion active), up to one million tokens of context, and support for text, image, video, and audio. On benchmarks like JobBench, MCP-Atlas, HLE-Diamond, and ZeroBench, Meta says it scores well ahead of Qwen 3.8, GLM 5.3, and Kimi K3 in several categories but still falls well short of Meta's paid Muse Wonder Full models .
The model is optimized for Apple's M5 Ultra and runs locally on two Mac Studios with 512 GB of unified memory each, according to Meta. Weights are on Hugging Face . The license is free to use but requires the label "Built with Muse Spark Open." Providers pulling in more than $20 million a year who want to offer the model as an API service need a separate agreement with Meta. More details are in the research blog .