I don’t think this is what you are looking for, but there are many IOS shortcuts that front end the OpenAI api with Siri, using Siri for voice input and output.

I don’t think this is what you are looking for, but there are many IOS shortcuts that front end the OpenAI api with Siri, using Siri for voice input and output. You can even ask ChatGPT how to create a shortcut like that.