In the past, it was possible to show the API diff between two releases, but I can't see that anymore. How are we supposed to see what's new?
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I’ve noticed the same, and I’m glad someone brought it up.
For the past few years, developer.apple.com/documentation offered a great feature to track changes between releases highlighting additions, modifications, and deprecations. It looked like this.
Unfortunately, that feature seems to be gone this year. While the diff URLs still technically load:
https://developer.apple.com/documentation/Swift?changes=latest_minorhttps://developer.apple.com/documentation/Swift?changes=latest_beta
…they no longer show any diffs, just a “BETA” badge on the newest APIs introduced in the ’26 OS releases.
I’ve filed feedback about this (FB18368421).
As a workaround, I’ve been digging into the .swiftinterface files to look for @available annotations tied to the new OS versions. For example:
Swift Standard Library
/Applications/Xcode-26.0.0-Beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface
SwiftUI
/Applications/Xcode-26.0.0-Beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/SwiftUI.framework/Modules/SwiftUI.swiftmodule/arm64e-apple-macos.swiftinterface
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