Meta Plans to Open-Weight Its Larger Muse Spark 1.2 Flagship Model

Meta intends to release the weights for Muse Spark 1.2, its larger closed flagship, CNBC reported on August 10, 2026. Weights are the trained parameters that let others run the model themselves. The move narrows the gap between Meta's proprietary flagship and its Apache 2.0-licensed open sibling. No release date was given.