Meta released Muse Spark Open on October 15, 2026, describing it as the most capable U.S. open-weight AI model to date

From the articleMeta and Apple team up to make Muse AI models run better on MacsAlso in Meta and Apple, Longtime Foes, Team Up to Put Open-Weight AI on Macs, "Mommy and daddy" play nice: Apple and Meta team up to bring open-source Muse to Macs, Muse Spark Open is Meta's answer to Qwen, GLM, and Kimi in the open-weight race