The two most noticeable things about macOS 27 Golden Gate are the newly updated Siri AI and the design changes that make windows and icons more consistent.

Swift 6.3 advances Swift cross-platform story with official Android support, improves significantly C interoperability through the new @c attribute, and continues extending embedded programming support. It also strengthens the ecosystem with a unified build system direction and gives developers more low-level performance control. By Sergio De Simone