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macOS 27.0 Golden Gate RC - What's New?

Status
The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
WilliApple

WilliApple

macrumors 68000
Original poster
rc.png

Release Date ― 9 September 2026
Build Number ― 26A428
Apple Silicon System Firmware Version ― 20457.1.29
Darwin Kernel Version ― 27.0.0: Tue Aug 11 21:05:57 PDT 2026; root:xnu-13432.1.9~1
Change Tracker
Feel free to edit this section to add changes! When adding issues, you are responsible for making sure it gets placed into the right category when future software releases. All issues that are in "New Issues" and "Remaining Issues" will be put into "Untested Issues" on the next release. Any abandoned issues will get dropped the following release.

New Features & Changes
Resolved Issues
New Issues
Remaining Issues
Untested Issues
  • Alarms may show the screen and notification but not play any sound. (FB10086690)
    • Workaround: Make your display not fall asleep in Settings > Lock Screen > Turn display off on ____ when inactive. You can turn your brightness off.
    • Issue present since macOS 13.0

Additional Notes
  • This is not currently usable on a day-to-day basis and certain apps may not work. To see those apps, you can check this thread.
    • MacBook Air: M1, M2, M3, M4, M5
    • MacBook Pro: M1/M1 Pro/M1 Max, M2/M2 Pro/M2 Max, M3/M3 Pro/M3 Max, M4/M4 Pro/M4 Max, M5/M5 Pro/M5 Max
    • MacBook Neo: A18 Pro
    • Mac mini: M1, M2/M2 Pro, M4/M4 Pro, M5 Pro, M6
    • iMac: M1, M3, M4
    • Mac Pro: M2 Ultra
    • Mac Studio: M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max, M5 Max/Ultra
Links
 
Last edited:
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It's a bit disappointing for what was meant to be a release focused on bug fixing. App Expose is still broken, minimised windows are no longer showing. It worked perfectly in macOS 26
 
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OptimusGrime said:
I’m hearing the describe an extension feature is absent from the RC. Can anyone confirm? I would be upset as it was a feature I was looking forward to.
Click to expand...
Screenshot 2026-09-09 at 3.07.23 PM.png

Still here on the RC for me!

My issue of iCloud Private Relay not functioning in virtual machines is still there.
I've reported it to Apple multiple times since Beta 6 since that's where it first broke, but it has still continued. sigh
 
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Anyone else seeing this UI bug in Safari on macOS 27 when mousing to the top of the screen during fullscreen video playback to reveal the traffic light controls? The control bar is seemingly missing a background. Not present in macOS 26. Screenshots attached for macOS 27 RC on my MB Neo (top) and macOS 26.6.2 on my 14-inch MBP (bottom).
macOS 27 RC beta MacBook Neo.png

macOS 26 MacBook Pro 14-inch.png
 
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Falcon9 said:
Anyone else seeing this UI bug in Safari on macOS 27 when mousing to the top of the screen during fullscreen video playback to reveal the traffic light controls? The control bar is seemingly missing a background. Not present in macOS 26. Screenshots attached for macOS 27 RC on my MB Neo (top) and macOS 26.6.2 on my 14-inch MBP (bottom).View attachment 2660608
View attachment 2660624
Click to expand...
Just tried it on my MacBook Pro docked to a Studio Display, I'm getting the exact same thing you see
 
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Honestly I miss the varied window corner radiuses. Each window radius matches the controls in the tool bar. Now the rounded buttons look funny next to the sharper corners.

Yes I know I can change the window corner radius with the terminal but then ALL windows will be super round even the ones that aren't supposed to be. I miss how Tahoe handled them.

I also hate the new traffic control buttons. They look super dumb in light mode. Dark mode they look pretty sick but I'm not a dark mode type of person.
 
It’s always something said:
Could you explain what this means? Are command line tools now a separate thing from the OS? I am coming back to a new MacBook after more than ten years away (Lion) , and I definitely want the command line tools, I would think. Thanks in advance!
Click to expand...
Screenshot 2026-09-09 at 11.58.43 PM.png

Command line tools are optional and not bundled with macOS by default.
They give extended functionality for developers and CLI (command-line interface) programs, like Xcode and Homebrew.

These tools are sometimes updated independently from macOS.
 
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It’s always something said:
Could you explain what this means? Are command line tools now a separate thing from the OS? I am coming back to a new MacBook after more than ten years away (Lion) , and I definitely want the command line tools, I would think. Thanks in advance!
Click to expand...

macOS comes with a certain amount of command-line tools. The larger set including what you'd need for certain compilation, command-line development, etc., are distributed as a separate package "Command Line Tools for Xcode," which is a free download. You can install that, or you can just install Xcode (separate free download), which I believe essentially bundles them.

You do not need a paid developer account to download the Command Line Tools or Xcode.

You don't even have to download them directly to install them—just type "xcode-select --install" in a shell in a terminal window, and that will do it for you.

developer.apple.com

Installing the command-line tools | Apple Developer Documentation

Install command-line tools for Xcode using an installer package or the Terminal app.
developer.apple.com developer.apple.com


In reality though, you almost certainly also want Homebrew, which is essentially a package manager for various UNIX / Linux / OSS utilities. It seems to keep utils way way more up-to-date than your typical Linux distro (but not all distros of course).

Homebrew can also install various third-party macOS apps at the command-line (these are distributed as Homebrew "casks"—i.e. binaries that Homebrew themselves didn't compile from source). I find it to be incredibly more convenient than manually downloading and installing a bunch of apps from various sources / websites.

Homebrew can also save your configuration into a "Brewfile" (like various other package managers). You can then use a Brewfile to more or less restore your dev environment tooling on a new machine in basically one step (after installing Homebrew).

brew.sh

Homebrew

The Package Manager for Everywhere.
brew.sh brew.sh

Note that Homebrew will automatically install the Command Line Tools (if they aren't installed already) when Homebrew is first installed.


To round out all of that, you should also look into terminals other than the built-in Terminal.app. Terminal.app is serviceable but behind in features and/or speed. The old favorite is "iTerm 2," which has every feature in the dang world (and better font rendering IMHO) but a little slower than newer models. The new hotness is probably "Ghostty," known for speed but a bit spare on features. There's also Kitty, Alacritty, WezTerm, etc., etc., etc…

https://iterm2.com/ (or "brew install iterm2" or really "brew install iterm2@beta")
https://ghostty.org/ ("brew install ghostty")
 
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isomorphic said:
macOS comes with a certain amount of command-line tools. The larger set including what you'd need for certain compilation, command-line development, etc., are distributed as a separate package "Command Line Tools for Xcode," which is a free download. You can install that, or you can just install Xcode (separate free download), which I believe essentially bundles them.

You do not need a paid developer account to download the Command Line Tools or Xcode.

You don't even have to download them directly to install them—just type "xcode-select --install" in a shell in a terminal window, and that will do it for you.

developer.apple.com

Installing the command-line tools | Apple Developer Documentation

Install command-line tools for Xcode using an installer package or the Terminal app.
developer.apple.com developer.apple.com


In reality though, you almost certainly also want Homebrew, which is essentially a package manager for various UNIX / Linux / OSS utilities. It seems to keep utils way way more up-to-date than your typical Linux distro (but not all distros of course).

Homebrew can also install various third-party macOS apps at the command-line (these are distributed as Homebrew "casks"—i.e. binaries that Homebrew themselves didn't compile from source). I find it to be incredibly more convenient than manually downloading and installing a bunch of apps from various sources / websites.

Homebrew can also save your configuration into a "Brewfile" (like various other package managers). You can then use a Brewfile to more or less restore your dev environment tooling on a new machine in basically one step (after installing Homebrew).

brew.sh

Homebrew

The Package Manager for Everywhere.
brew.sh brew.sh

Note that Homebrew will automatically install the Command Line Tools (if they aren't installed already) when Homebrew is first installed.


To round out all of that, you should also look into terminals other than the built-in Terminal.app. Terminal.app is serviceable but behind in features and/or speed. The old favorite is "iTerm 2," which has every feature in the dang world (and better font rendering IMHO) but a little slower than newer models. The new hotness is probably "Ghostty," known for speed but a bit spare on features. There's also Kitty, Alacritty, WezTerm, etc., etc., etc…

https://iterm2.com/ (or "brew install iterm2" or really "brew install iterm2@beta")
https://ghostty.org/ ("brew install ghostty")
Click to expand...
Thanks very much!
 
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