After getting frustrated with Siri's inability to answer pretty basic questions with actual answers instead of "I searched the web for you", I figured out how to get GPT-3 integrated pretty seamlessly with Siri. Sharing it here in case it's useful for anyone else!
The Siri shortcut is here:
https://www.icloud.com/shortcuts/b10d3d361a3f48428a2ed8fe729...
(You'll need to add your OpenAI API key to the shortcut and update your Siri accessibility settings to get it to work smoothly – see the above-linked blog post for more detailed instructions.)
You can see the short writeup with instructions here: https://alexkolchinski.com/2023/02/03/how-to-talk-to-gpt-3-t...
The Siri shortcut is here: https://www.icloud.com/shortcuts/b10d3d361a3f48428a2ed8fe729... (You'll need to add your OpenAI API key to the shortcut and update your Siri accessibility settings to get it to work smoothly – see the above-linked blog post for more detailed instructions.)