Muse Spark Open weights released October 15, 2026

On October 15, finkd said Muse Spark Open’s weights were releasing that day and that the model ran well on new Mac Studios thanks to work with Apple and John Ternus. Meta says the weights are available for download and lists 816 billion total parameters, 42 billion active parameters, a 1 million-token context and native multimodal capabilities. It says the model was built for coding and agentic work.