Meta releases Muse Spark Open model for coding and agentic tasks

Meta released Muse Spark Open on October 15, 2026, as an open-weight artificial intelligence model designed for advanced coding and agentic tasks. Times Of AI, MarkTechPost, and Reuters all reported that the new model features an 816-billion-parameter architecture with a one-million-token context window. [1][2][5][10]

The mixture-of-experts model runs 42 billion active parameters. Reports differ on the precise desktop hardware needed to run it locally. Times Of AI reported that the model can run on a desktop setup using two Apple M2 Ultra Mac Studios. However, MarkTechPost reported that the setup requires two M5 Ultra Mac Studios. As FTMQ SI reported earlier, Meta collaborated with Apple to enable desktop execution using two Mac Studio systems. [1][2][10]

Open weights are the publicly released learned parameters of a trained artificial intelligence model, including its numerical weights and biases. Releasing these values allows developers to download and execute the model directly. MarkTechPost reported that Muse Spark Open leads open models on the MCP-Atlas benchmark. [2][9]

Times Of AI reported that Meta has made the model weights available across multiple platforms. According to Times Of AI and VentureBeat, the release expands developer customization options for locally operated systems without relying on cloud infrastructure. [1][7]