MacOS Big Sur beta 5 is now available to download for all users who are registered to participate in the beta testing programs.
Typically the developer build comes along first and is quickly followed by the same build as a public beta release. Anyone can download and install the macOS Big Sur public beta on a compatible Mac, but beta system software is best reserved for advanced users on secondary hardware.
The release of the fifth beta of macOS Big Sur comes just after iOS 14 beta 5 and iPadOS 14 beta 5 were also released, along with the fifth betas of watchOS 7 and tvOS 14.