"It will be available in private preview via API to select partners, and we hope to open-source future versions of the model." from Facebook Newsroom: https://

"It will be available in private preview via API to select partners, and we hope to open-source future versions of the model." from Facebook Newsroom: https://about.fb.com/news/2026/04/introducing-muse-spark-meta-superintelligence-labs-first-model-built-to-prioritize-people/#:~:text=It%20will%20be%20available%20in%20private%20preview%20via%20API%20to%20select%20partners%2C%20and%20we%20hope%20to%20open%2Dsource%20future%20versions%20of%20the%20model. https://about.fb.com/news/2026/04/introducing-muse-spark-met...