Not sure where you work but at ours we have api access to all of them and can freely switch.
I’ve seen enterprises have access to all the harnesses but not all the models within them
and they ask dumb followup questions after 7 business days when you want different access
At my job people discuss almost weekly what the best models are for various price/quality points, with our CTO in particular wanting us to make sure we're being cost-effective in terms of what we're using for a given task (his words are basically "I don't want you to use these tools less, I just want you to use them effectively")