With the release of macOS Ventura 13.5 for developer testing

Apple has reopened the beta programme.

The most recent builds are available to developers

who are enrolled in the beta programme by visiting the Apple Developer Centre

The Apple Beta Software Programme provides access to public beta versions.

which are usually issued soon after developer versions.

The build number for the first beta of macOS Ventura 13.5 is 22G5027e.