macOS 27 Golden Gate's biggest change is a redesigned Siri that works more like context-aware AI assistants already in Chrome and Firefox. You can invoke it anywhere on your screen to answer questions about what you're looking at, summarize content, or find alternatives to products. The system lets you either show Siri your entire window (Command + Shift + Space) or select a specific portion using a crosshair tool (Command + Shift + 6) before asking questions. Since Siri now has access to your files, emails, and messages, you can search for membership IDs, trip details, or embargo dates without opening individual apps. The writing features work particularly well on Mac — you can select text and ask Siri to proofread, rewrite, or improve it, or have it draft something from scratch in any text box. Spotlight Search got a serious upgrade too. You can now ask Siri questions directly within Spotlight to get web results, and you can narrow searches to specific categories like Applications, Files, Actions, or Clipboard. It'll also run Shortcuts and show your recent search history. The author tested it pulling up membership IDs and trip information without digging through files, and while it doesn't match Raycast's extensibility, it's a substantial improvement over the old version. Safari gained AI-powered page tracking for monitoring price drops and policy changes on sites without RSS feeds, plus automatic tab organization by topic. The visual overhaul brings Liquid Glass icons with adjustable sliders, better window diffusion effects, more consistent corner radius across app windows, edge-to-edge sidebars with colorful icons, and clearer highlighting of active windows. The OS also adds file naming suggestions based on context when you download or save documents, improved child safety controls, cross-platform photo albums, and quick calendar event suggestions. macOS 27 Golden Gate is available now for MacBook Air and Pro (2020+), iMac (2021+), Mac Mini (2020+), Mac Studio (2022+), Mac Pro (2023+), and MacBook Neo — all requiring Apple Silicon.