Meta releases Muse Spark Open: 816B/42B active, 1M context, most capable US open-weight model
AIatMeta · x · 2026-10-16
Meta officially released Muse Spark Open, calling it the most capable US open-weight model to date. Built for coding and agentic work, it targets long-horizon tasks, complex software engineering, and multi-step reasoning. Key specs: 816B total / 42B active parameters, 1M token context window, natively multimodal across text, image, video, and audio.
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