Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date research.meta.ai

Meta has released the weights for Muse Spark Open, a multimodal model with 816 billion total parameters, 42 billion active parameters and a 1-million-token context window, aimed at coding and agentic tasks. The company says it can run on two Apple M5 Ultra Mac Studios and is available through several model platforms under a license with limited commercial terms.