They're only cheaper if you ignore the cost of training a one-off model. If I'm only ever running the model 10,000 times to do some task it probably doesn't mat

They're only cheaper if you ignore the cost of training a one-off model. If I'm only ever running the model 10,000 times to do some task it probably doesn't matter if I'm using ChatGPT or a more efficient custom model, and in fact ChatGPT is probably cheaper and easier.