Muse Spark Open: The Most Capable US Open-Weight Model Yet Runs on Two Mac Studios

Muse Spark Open, the Most Capable US Open‑Weight Model to Date

Muse Spark Open is a natively multimodal 816B-parameter model (42B active) with a 1M-token context window, built for coding and agentic work. It is the first model in its class to run on a desktop using two Apple M5 Ultra Mac Studios with MLX. Weights are available on Hugging Face, and it is served through partners like Baseten, Fireworks AI, Groq, and Together AI.