Foundation Model Framework

Machine Learning & AI Foundation Models Apple Intelligence

Created Jun ’25

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Greetings! I was trying to get a response from the LanguageModelSession but I just keep getting the following:

Error getting response: Model Catalog error: Error Domain=com.apple.UnifiedAssetFramework Code=5000 "There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.MobileAsset.UAF.FM.Overrides" UserInfo={NSLocalizedFailureReason=There are no underlying assets (neither atomic instance nor asset roots) for consistency token for asset set com.apple.MobileAsset.UAF.FM.Overrides}

This occurs both in macOS 15.5 running the new Xcode beta with an iOS 26 simulator, and also on a macOS 26 with Xcode beta. The simulators are both Pro iPhone 16s.

I was wondering if anyone had any advice?

Boost

APDA_Member OP

I have the same problem with Xcode 26.2 and the iOS 26 simulator (iPhone Pro 17). Apple Intelligence works when targeting macOS, just not when targeting the iOS Simulator. I can reproduce this trivially with the FoundationModelsTripPlanner sample.

Apple Designer OP

Apple

Hi all!

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

After you update Xcode and simulator, those should work right away.... but when you update your physical device or VM expect some delay. Once you update the correct version of the model assets have to finish downloading, which could take a few hours depending on your network and device power.

michaeljdouglas OP

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.