Meta Releases Muse Spark Open, a 816-Billion Parameter Open-Weight Model Optimized for Mac Studio

Meta unveiled Muse Spark Open on October 15, marking the company's most ambitious open-source foundation model release to date. The 816-billion parameter model, featuring 42 billion active parameters and a 1-million token context window, is engineered for coding and complex agentic workflows, positioning Meta as a direct competitor to proprietary closed models from OpenAI and Anthropic.