MacRumors published a story that Apple has released the sixth beta of macOS 14 Sonoma to registered developers.
Apple Seeds Sixth Beta of macOS 14 Sonoma to Developers
Apple today seeded the sixth beta of the upcoming macOS 14 Sonoma update to developers for testing purposes. The beta comes two weeks after the launch of the fifth beta.
Registered developers can download the beta through the Apple Developer Center and after the appropriate profile is installed, with the betas available through the Software Update mechanism in System Settings.