Muse Spark Open

Muse Spark Open is Meta's open-weight, natively multimodal mixture-of-experts model with 816 billion total parameters and 42 billion active per token. It accepts text, images, video, and audio and produces text. Meta designed it for multi-step reasoning, coding agents, tool use, and multimodal understanding of screenshots, documents, recordings, and video. Sciforium's on-demand offering uses MXFP4 weights on MI355X GPUs with a 1,048,576-token context window.