Apple on-device model is unavailable

Symptom

A run reports the on-device model as unavailable, with an availability reason.

Why it happens

Apple Intelligence has to be enabled and its assets downloaded before FoundationModelsModel can serve requests. Availability is a device and OS state, not something the SDK controls.

Fix

Check before constructing, and fall back to a cloud model when it is not ready:

let model: any LanguageModel = FoundationModelsModel.isAvailable
  ? FoundationModelsModel()
  : AnthropicModel("claude-sonnet-5")

FoundationModelsModel.availability carries the reason, which is worth surfacing rather than swallowing. Foundation Models also reports no token usage, so statistics readouts stay empty on that path.

See also

• On-device models