It hasn't done that to me. It's worked according to their docs:
reply> Copilot Chat uses one premium request per user prompt, multiplied by the model's rate.
> Each prompt to Copilot CLI uses one premium request with the default model. For other models, this is multiplied by the model's rate.
> Copilot coding agent uses one premium request per session, multiplied by the model's rate. A session begins when you ask Copilot to create a pull request or make one or more changes to an existing pull request.
https://docs.github.com/en/copilot/concepts/billing/copilot-...
Sorry, I should have specified this was with GHC CLI. I suppose that might not behave similarly to the GUI extension. But it definitely happened on Thursday. One prompt, ctrl-c out and it said 13 premium messages used. It was reading a couple of large files and Opus doesn't seem to let the harness restrict it from reading entire files... just a couple hundred lines at a time.
replyand now I see your comment mentions that explicitly. The output was quite unambiguous. :shrug: