For all of these weird errors, you'll need a matching Xcode version, Simulator version, and macOS version for everything to work. You also need all versions to be at least 26.0, otherwise the model assets simply aren't there. e.g. Xcode 26.2, iOS 26.2 simulator, macOS 26.2 Hi there I started seeing this after I updated my Mac (and XCode) to 26.2. To clarify, are you saying that I must use iOS version 26.2 with in Simulator if I am developing with Foundation Models now? I have been developing my app for iOS 26.0 and above and all of my calls to Foundation Models now give this error. I can't develop for 26.0 now? That doesn't seem right.

There is a related thread here with a workaround that I've been able to use: https://developer.apple.com/forums/thread/762711 The RC Release Notes don't explicitly mention NSDecimalRound but given what it says in there about the other NSDecimal* functions, I assume it's affected. The RC notes should be updated to include this function as well, imo.

I think there's a valid use case for initiating a Tap to Cash with someone. I have a bill splitting app on the App Store that I would like to integrate with it somehow.