Option to select model

[pablopunk]

First of all, thanks for creating the plugin! Very simple, very useful.

Maybe I'm missing some config but is it possible to customize the model it uses? Since codex already supports this:

$ codex -m o3

Something like this would be nice:

opts = {
  model = 'o3-mini'
}

[johnseth97]

Great suggestion, I'd like to implement this improvement! Should be very simple.