ChatGPT, GPT3.5turbo, GPT3.5

Hi everyone,

I have little knowledge about GPT family before but am really impressed by those API/models regarding their abilities on various tasks. However, when I read official introductions/documents of those models, I found a bit confused, especially about their differences and relationships between them.

  1. Does ChatGPT always refer to single product or a series of models fine tuned on GPT3.5 series models?
  2. Is ChatGPT = GPT 3.5 turbo? Is there any difference between them?
  3. Is GPT3.5 turbo trained with RLHF as well?

If you have any thoughts or suggestions, please leave a comment below. Thanks in advance for your input!