It appears that the future of personal voice assistants is nearer than we thought. I've just put together a brief demo where I use both Greek and English to interact with a native macOS SwiftUI app that I developed by combining the OpenAI GPT4 and Whisper and tweaking the instructions of various swiftui coders here and there.
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https://www.youtube.com/watch?v=F1fKqAnKkAY