The current voice transcription engine at OpenAI is using Whisper-1[0] which is open source and runnable locally, if you wanted to keep it all on-device. I run it locally for various things and it works pretty damn well.

[0] https://github.com/openai/whisper

I have used whisper but it seems very picky about which device it will perform well on ("well" meaning quickly)

So is Google’s version and it’s a 100x difference, but agree re OpenAI.

> Siri is all on device.

No it’s not. Try doing literally anything without an active internet connection and she’ll say “I’m having trouble connecting”