Meta Releases Muse Spark Open, 816B Multimodal Open-Weight Model for Agentic Coding

Meta has released Muse Spark Open, a 816-billion-parameter open-weight model designed to run on consumer hardware, marking a major shift in accessible frontier AI for developers. The 42-billion-active-parameter mixture-of-experts model, announced October 15, 2026, brings natively multimodal capabilities—ingesting text, images, video, and audio—with a 1-million-token context window optimized for long-horizon agentic tasks, complex software engineering, and multi-step reasoning.