I prototyped a few different concepts in every version of iOS 26 since WWDC, and I’ve yet to find any real world use cases for the foundation models framework that aren’t broken by the guardrails - even if you’re just interfacing with your own data sets. This is a shame because Apple’s model is really great for its size, and shipping a local copy of Mistral or Qwen with every app is a waste of space and power. Here’s a simple prompt that results in two different levels of guardrail errors: “What is the phone number for emergency services in the US?”