Meta releases Muse Spark Open, an 816B coding model on NVIDIA GB300 NVL72

Meta launches Muse Spark Open, a coding-optimized mixture-of-experts model with 816B total parameters, 42B active parameters, and a 1M token context window. The model was trained on NVIDIA GB300 NVL72 Blackwell Ultra systems for agentic coding workflows. The source says it offers higher first-attempt accuracy, reliable tool calling, and deep codebase understanding across repositories.