Apple Releases Second Golden Master of macOS Sierra for Developers - MacRumors
Skip to Content

Apple Releases Second Golden Master of macOS Sierra for Developers

Apple today released an updated golden master (GM) version of macOS Sierra to developers, a week and a day after releasing the first golden master following its September 7 event. The golden master represents the final version of macOS Sierra that will be released to the public on Tuesday, September 20.

The golden master update can be downloaded through the Apple Developer Center at this time, and it is not clear if it will be available through the Mac App Store. The new GM seed is build 16A323, while the build released last week was 16A320.


macOS Sierra is a major update that brings Siri to the Mac for the first time, allowing users to conduct voice searches to quickly find files, look up information, and more. New Continuity features offer an "Auto Unlock" option for unlocking a Mac with an Apple Watch and a "Universal Clipboard" for copying text on one Apple device and pasting it on another.

Deeper iCloud integration allows files stored on the desktop or the Documents folder of a Mac to be accessed on all of a user's devices, and Photos features deep learning algorithms for improved facial, object, and scene recognition. There's also a Memories feature for displaying photo collections, and Messages has rich links, bigger emoji, and "Tapback" response options.

Apple Pay is coming to the web in macOS Sierra, with payments authenticated through an iPhone or Apple Watch, and new features like multiple tabs, Picture in Picture multitasking, optimized storage, and revamped emoji are also available.

macOS Sierra will be officially released to the public on September 20 and it will be available for free to all users with a compatible Mac. For full details on all of the new features included in the update, make sure to check out our macOS Sierra roundup.

Related Forum: macOS Sierra

Popular Stories

apple pro tell logo

Apple Launching Five New Products This Friday

Monday November 2, 2026 1:22 am PST by
Apple is releasing five new products this Friday, November 6, following pre-orders that opened last week, including its first touchscreen MacBook Pro models. The following new products will be available from Friday: iPad mini with OLED display and A20 Pro chip iMac with M6 chip 14-inch MacBook Pro with M6 chip 14-inch MacBook Pro with OLED touchscreen 16-inch MacBook Pro with OLED...
Apple Logo Gradient 16x9 1

Apple Isn't Done With 2026: Here's What's Still Coming

Monday November 2, 2026 7:27 am PST by
Apple's busiest season isn't over yet. Far from it. With two hardware launch dates still to come in November, plus software updates and new smart home accessories running into December, there's more on the way from Apple before the end of 2026, so be sure to stick around. Below, we've rounded up what's still coming, along with one date in particular that's worth watching if you're a holiday...
Apple Store Logo

Apple Store in UK Permanently Closing Later This Month

Tuesday November 3, 2026 7:34 am PST by
Apple today announced that its Festival Place store in Basingstoke, England will be permanently closing on Saturday, November 21. Apple Festival Place Apple had already announced that the store would be closing in November, but it had not provided the public with a specific date until now. Apple's store inside the Festival Place shopping center opened in 2011, so it had a 15-year run....

Top Rated Comments

ksnell Avatar
132 months ago
I thought Golden Master meant that was it?
Score: 11 Votes (Like | Disagree)
decimortis Avatar
132 months ago
I may be ignorant of what Golden Master actually means...

Attachment Image
Score: 9 Votes (Like | Disagree)
skwood Avatar
132 months ago
This is not the second GM, so far we've seen build 319, 320, 322 and now 323. There have been no delta updates for any of these. You can download the latest by re-downloading macOS Sierra from the Purchased tab in the MAS.
Score: 8 Votes (Like | Disagree)
JackieTreehorn Avatar
132 months ago
I may be ignorant of what Golden Master actually means...
Inconceivable!
Score: 6 Votes (Like | Disagree)
benjitek Avatar
132 months ago
It's actually the 3rd GM version, the 2nd version, 16A322, was quietly released on 9/13 and 16A323 launched today. Neither of these versions would update by clicking the [Download] button at the developers site, at least they wouldn't when I tried. The only way I could install them was by clicking [Download] in the AppStore purchase-history.
Score: 6 Votes (Like | Disagree)
JackieTreehorn Avatar
132 months ago
I clearly can't choose the golden master in front of you.
I'm not a witch, I am your wife.
Score: 5 Votes (Like | Disagree)
Latest Stories
Apple Launching Five New Products Tomorrow
Apple Launching Five New Products Tomorrow
13 minutes ago
Apple Releases Safari Technology Preview 256 With Bug Fixes and Performance Improvements
Apple Releases Safari Technology Preview 256 With Bug Fixes and Performance Improvements
9 hours ago
Apps Can Now Try to Stop You From Canceling Subscriptions
Apps Can Now Try to Stop You From Canceling Subscriptions
9 hours ago
'Super Mario Odyssey' Can Now Run on Apple TV Thanks to AI
'Super Mario Odyssey' Can Now Run on Apple TV Thanks to AI
10 hours ago
How 'Resident Evil' Director Zach Cregger Uses His iPhone to Make Movies
How 'Resident Evil' Director Zach Cregger Uses His iPhone to Make Movies
11 hours ago
HomePod Mini 2's Amount of RAM Confirmed
HomePod Mini 2's Amount of RAM Confirmed
11 hours ago
Apple TV's '12 Days of Snoopy' Special Arrives November 13
Apple TV's '12 Days of Snoopy' Special Arrives November 13
12 hours ago
Apple is Putting Employees on an AI Budget
Apple is Putting Employees on an AI Budget
13 hours ago
Apple Releases Xcode 27.3 Beta With Three New Features
Apple Releases Xcode 27.3 Beta With Three New Features
14 hours ago
Apple Will Check Public iCloud Links for Harmful Content Starting in iOS 27.3
Apple Will Check Public iCloud Links for Harmful Content Starting in iOS 27.3
14 hours ago
macOS 27.3 Brings Live Activities to Macs Without Dynamic Island
macOS 27.3 Brings Live Activities to Macs Without Dynamic Island
16 hours ago
Apple TV Reportedly Planning 'Silo' Spinoff
Apple TV Reportedly Planning 'Silo' Spinoff
16 hours ago
Is It Worth Buying a Titanium Apple Watch?
Is It Worth Buying a Titanium Apple Watch?
17 hours ago
macOS 27.3 Includes an Important Security Fix
macOS 27.3 Includes an Important Security Fix
17 hours ago
Massive Sale Hits Apple Watch Ultra 3 With Record Low $250 Discounts
Massive Sale Hits Apple Watch Ultra 3 With Record Low $250 Discounts
18 hours ago
Does HomePod Mini 2 Have Improved Sound? Here's What Reviews Say
Does HomePod Mini 2 Have Improved Sound? Here's What Reviews Say
18 hours ago
macOS 27.3 Makes Markdown Files Easier to Read
macOS 27.3 Makes Markdown Files Easier to Read
19 hours ago
HomeView Pre-Order Returns to $289.99 on Amazon
HomeView Pre-Order Returns to $289.99 on Amazon
19 hours ago
Apple May Phase Out Non-Touch High-End MacBook Pros
Apple May Phase Out Non-Touch High-End MacBook Pros
20 hours ago
Apple's Insider Trading Policy Now Covers Prediction Markets
Apple's Insider Trading Policy Now Covers Prediction Markets
20 hours ago
'Stick' Season 2 Premieres Today on Apple TV
'Stick' Season 2 Premieres Today on Apple TV
21 hours ago
iPhone 18e Rumored to Focus on Chip Upgrade With Few Major Changes
iPhone 18e Rumored to Focus on Chip Upgrade With Few Major Changes
21 hours ago
Google Maps Updated to Fully Support iPhone Duo Displays
Google Maps Updated to Fully Support iPhone Duo Displays
21 hours ago
Everything New in the iOS 27.3 Beta
Everything New in the iOS 27.3 Beta
1 day ago
Apple Music's New Selfie Sing Feature Lets You Record Karaoke Videos
Apple Music's New Selfie Sing Feature Lets You Record Karaoke Videos
1 day ago
iPhone Jailbreak Gets Past Lockdown Mode and Survives an Update
iPhone Jailbreak Gets Past Lockdown Mode and Survives an Update
1 day ago
iPadOS 27.3 Expands Siri Mode to Camera App
iPadOS 27.3 Expands Siri Mode to Camera App
2 days ago
Veterans Day Apple Watch Activity Challenge Launches November 11
Veterans Day Apple Watch Activity Challenge Launches November 11
2 days ago
Best Early Black Friday Mac Deals: Save Hundreds on MacBook Air, Mac Mini, and More
Best Early Black Friday Mac Deals: Save Hundreds on MacBook Air, Mac Mini, and More
2 days ago
Apple Fitness+ Gets Gym Strength Plans in iOS 27.3
Apple Fitness+ Gets Gym Strength Plans in iOS 27.3
2 days ago