MacRumors published a story that Apple has released the fifth developer beta of macOS Sequoia 15.1 to registered developers.
Apple Seeds Fifth Developer Beta of macOS Sequoia 15.1
Apple today provided developers with the fifth beta of an upcoming macOS Sequoia 15.1 beta, with the new update coming a week after Apple released the fourth beta.
Registered developers can opt-in to the macOS Sequoia beta through the Software Update section of the System Settings app. An Apple ID associated with an Apple Developer account is required to get the beta.