macOS 27 Beta has a secret Siri AI interface. How to try it.

You've waited long enough for Apple's relaunch of Siri as an AI assistant, and now you can finally try out the Siri AI beta for iOS. But, psst, don't tell anyone, but there's even more Siri AI for you to try out with a secret Siri AI interface on Mac.

A Reddit user on the r/MacOSBeta subreddit has discovered a "hidden lightweight UI" for Siri AI in the macOS 27 Golden Gate beta. This feature basically provides users with an array of AI tools, presented in a pop-up menu whenever text is highlighted.

The Siri AI pop-up interface includes AI tools such as Rewrite, Proofread, "How does this sound?," and "Edit with Siri." There are also menu options for summarization and providing bullet points from the selected text.

Siri AI can also provide a selection of specific tools dependent on the context of what's selected. For example, highlighting a phone number provides a pop-up to "Add to contacts" or when selecting an address the pop-up offers an "Open in Maps" option. There are tools for creating calendar events, composing messages and emails, and tracking flights and packages as well.

Why is the feature hidden? Well, as MacRumors points out, the Siri AI interface in macOS 27 developer beta 3 and public beta 1 is simply an unfinished product. Certain features don't yet work how they're supposed to. Some options don't work at all. Clearly, Apple has yet to make it available because it's simply not ready.

However, Reddit users say there is a way to turn the interface on in the macOS Golden Gate Beta. According to Redditor pdfu, if users running the macOS 27 beta simply need to open up the Terminal and input a few lines of code.

Please note: We do not recommend running terminal instructions or changing important OS files unless you fully understand what you're doing. We have not tested these terminal instructions, so proceed at your own risk.

sudo mkdir -p /Library/Preferences/FeatureFlags/Domain && sudo defaults write /Library/Preferences/FeatureFlags/Domain/WritingTools LightweightUI_macOS -dict Enabled -bool true

After that, the Reddit threat instructs users to restart their computer and the Siri AI interface will be enabled.

If you've had enough of the unfinished interface, you can turn it back off by once again opening Terminal and the following input:

sudo defaults write /Library/Preferences/FeatureFlags/Domain/WritingTools LightweightUI_macOS -dict Enabled -bool false

It's unclear if the Siri AI interface will launch with the official version of the new macOS. However, it's certainly interesting to see Apple further brand its Siri AI relaunch as an all-in-one AI tool across the company's products.