The update, build number 15A282b, is available through the software update mechanism in the Mac App Store and through the Apple Developer Center.
It is not clear if the OS X 10.11 GM will add any new outward-facing changes to El Capitan, as many of the prior betas have focused on under-the-hood performance improvements and bug fixes to optimize the operating system ahead of its public release.
During the beta testing period, Apple seeded eight betas of OS X El Capitan to both developers and public beta testers. The final beta, beta 8, was seeded two weeks ago, on August 31.
As an update complementary to OS X Yosemite, OS X El Capitan builds on the features introduced last year. Behind-the-scenes improvements in El Capitan make a number of apps and processes on the Mac faster, and the introduction of Metal makes system-level graphics rendering 40 percent more efficient.
El Capitan introduces a new system-wide font, a revamped Mission Control feature, a split-view feature for using two full-screen apps at once, deeper functionality for Spotlight, and improvements to Safari that include Pinned Sites and a universal mute button.
OS X El Capitan will be released to the public on September 30.
