Honestly, I’m surprised that a simple quick fix to specify a custom model to use in order to test an api endpoint has still not been urgently rolled out yet after a week of documenting this issue (which from the responses of 0.47 so far has been concerning this issue). At least for the quickest patch, have the user be able to select a model from the model list to test the api or just save the key regardless (make key override available in settings):