# Muse Spark

- [Meta's Muse Spark Is Closed Source. Open-Source AI Just Lost Its Last Major Patron.](https://sdd.sh/2026/04/metas-muse-spark-is-closed-source.-open-source-ai-just-lost-its-last-major-patron..md): Meta Superintelligence Labs shipped Muse Spark — and made it closed-source. The company that framed open AI as a moral imperative just locked the door. Here's what that means for developers who built their stack on Llama.