Apple released macOS 27 Golden Gate beta 3, build version 26A5378j, to developers two weeks after a buggy second beta. This latest version arrives as the first build following WWDC and aims to stabilize the system after previous reliability issues.

UI updates focus on Liquid Glass, which now includes a slider for precise control over UI transparency and opacity. Apple also standardized rounded corners across all system windows and apps to fix consistency errors found in macOS 26.

Integration of Siri AI relies on third-generation Apple Foundation Models and a new indexing system to improve answer accuracy. These changes move Apple toward a more cohesive AI-driven OS experience, though the focus on minor UI polish suggests the core feature set is mostly locked.

These updates show Apple is prioritizing visual consistency and AI precision over major feature additions. The shift toward granular UI controls gives power users more agency over their desktop aesthetic while the new indexing system attempts to solve Siri's long-standing retrieval problems.