Private Cloud Compute uses their own hardware: https://security.apple.com/blog/private-cloud-compute/

Thanks! I wonder how they enforce retention of personal data if a user adds identifying data and they use a model from anthropic or wtv like others said. maybe that is the wrong question at all if they are using their own models but i thought they didn't. Apple's AI strategy on the whole sounds coherent to me but the specifics are super confusing.