Probably Jeremy can clarify further on this, but the message on the original post suggests that there should be a change in the endpoint used to be able to achieve that.
This was the same issue I faced on the first day gpt-3.5-turbo was out. Since it used a different API endpoint, Make (formerly Integromat) didn’t allow me to specify gpt-3.5-turbo as the model to use for my calls. They build a solution some days later, and it uses a different “branch” in their options.