Meta releases Muse Spark Open, an 816B-parameter open-weight model

Meta released the weights of Muse Spark Open, a natively multimodal mixture-of-experts model with 816 billion total and 42 billion active parameters and a 1M-token context, which it calls the most capable US open-weight model to date. It runs on two linked M5 Ultra Mac Studios and is available on Hugging Face, Google Cloud and Amazon SageMaker under the Muse Model License.