Yeah my understanding was 3.5-turbo was always the model behind chatGPT. There is no 3.5 non-turbo model in OpenAI’s playground at least or in their documentation: https://platform.openai.com/docs/models/gpt-3-5
It is, now. Their first paid chat model is what is now called 'Legacy' in the paid chat model selection pulldown. It performs noticeably better than the turbo version in all cases except for generation speed. Not vastly. But enough of a difference to make it worth mentioning.
