Meta Releases Muse Spark Open, an 816-Billion-Parameter AI Model Optimized for Apple Silicon

Meta has released Muse Spark Open, marking the first time a frontier-class AI model can run locally on consumer-grade desktop hardware. The 816-billion-parameter sparse mixture-of-experts model activates 42 billion parameters per token and supports a 1-million-token context window, positioning it as the most capable US open-weight model available.