Does everyone already know just by seeing “copilot” which model is being used?

The author didn’t tell us, so if we don’t know the model, what is the use of the article? The model matters a lot.

Author here.

My main complaint is with the ergonomics of the IDE integration, does that differ between model?

I've used whatever has been the model de jour from the first public beta until fairly recently. Haven't experienced drastic quality changes between them.