Try to reimport your model within playground app. I think your model aren't being included in project's build target. I can't verify this, but I think model imported correctly show under a separate Resources section on sidebar. But I am very unsure about this. Furthermore, in your compiled model class make sure you modified the path for urlOfModelInThisBundle class. See this tutorial: https://marquiskurt.net/post/687335457365868544/using-core-ml-in-a-swift-playgrounds-app

I am building something with CoreML with exact same technique you are using, and it works for me. I think what's happening with your project is the model file isn't being copied to your app bundle. Because playground didn't properly assign file's target membership. In my case, my project works and compile fine with the playgrounds app (macOS & iPadOS). But would crash if I open my project within Xcode. Because playground project current't doesn't support target at all. I can't find anyway to fix this. Except I would suggest reimport the model with the playground app.