MacRumors published a story that Apple has released the first beta of macOS Ventura 13.1 to registered developers.
Apple Seeds First Beta of macOS Ventura 13.1 to Developers
Apple today seeded the first beta of an upcoming macOS Ventura 13.1 update to developers for testing purposes, with the beta coming one day after the official launch of macOS Ventura.
Apple Seeds First Beta of macOS Ventura 13.1 to Developers
Registered developers can download the beta through the Apple Developer Center and after the appropriate profile is installed, betas will be available through the Software Update mechanism in System Preferences.