which raises the question, is the model in the demo actually gpt-6? or it is gpt realtime 2.1? It's unclear how gpt-6 can interact at the realtime level and if so, how can developer get access to it?

I ran into the same problem as you, so I ended up by coding a local app that is very similar to Wispr Flow, but uses the small english Whisper model on my low-end Windows laptop.

It is still a quite fast. In fact, I just typed this in using this app.