Will do. It DOES work for me when I create a volume on my internal drive and install macOS 26 there. Still, though - not working because it's an external drive? 😬

Thanks Ziqiao. I got the sysdiagnose and was all ready to file the report with a screenshot of the macOS Apple Intelligence settings when I saw this for the first time: "Apple intelligence is not available when starting your Mac from an external volume." I am running it off of a NVMe connected via Thunderbolt. I suppose that the only way I could get this to work is to install it on an internal volume :(

Update: I installed macOS 26 on real metal and the Foundation Model Framework still gives the same error in the simulator. I can now report that the only way I have been able to use this so far is on: macOS Sequoia 15.5 Xcode 26 beta Real iPad Pro running iPadOS 26 beta It has NOT worked for me in the following stacks: macOS 26 beta on real metal using iPhone 16 Pro Max simulator macOS 15.5 with Xcode beta using iPhone 16 Pro Max simulator macOS 26 beta in a VM using iPhone 16 Pro Max simulator Has anyone else had any other successes? Sure would be great to get a simulator working.

@softwarebyeugene were you able to get macOS 26 installed on a separate volume? If so, and you did it with the ipsw, can you briefly describe your process? I've got it on a VM, but want to put it in a dual-boot environment.

Thanks for the reply! It's a brand new app on iOS 26 in Xcode beta. But the simulator does not have much to "say" in the "Apple Intelligence & Siri" settings. I've got the language set to English (United States) and that matches the language and region settings. Xcode beta and the simulators are running in the restored ipsw macOS 26 in UTM. Within macOS settings, there is only a "Siri" item. It doesn't say "Apple Intelligence & Siri" like the iOS simulator does. Not sure why (possibly because of virtualization?). It's English-US, so I think I'm good. Due to English-US, I think I'm good. So ... myeah. Still struggling with this. If the answer is that Apple Intelligence doesn't work on virtualized hardware for macOS 26, then where would I learn how to install the ipsw on a real volume so I can boot into it?