Thank you very much for sharing about your experiences with gpt-5-chat-latest. I've heard from another user that it is also as fast as 4o, slightly cheaper, and smart.
We are still working on our plan internally on which new models to support in LiveKit Inference. If we end up including support for 5-chat, I will let you know.
LiveKit Inference is not GDPR compliant yet. Users can't specify that their model requests and responses stay in a particular region, Scale tier customers can request region pinning for media transport, but not inference.