The GM (Golden Master) builds are only seeded by Apple to application developers as the last milestone in the development cycle of the soon-to-be-released iOS 12, watchOS 5, and tvOS 12 operating system series, which are expected to hit the streets next Monday, and the Monday after for macOS 10.14 Mojave.It's past that, beta 11 is definitely the GM.
A GM version of macOS 10.14 Mojave should be available as well next week to conclude the development cycle of Apple's next-generation operating system for its Mac computers. Until then, registered developers will have to install one more beta version that's available as we speak via OTA (Over-the-Air) updates, along with the Xcode 10 beta GM seed.