To be precise, ChatGPT 3.5 turbo being 20B is officially a mistake from a Microsoft Researcher, quoting a wrong source published before the release of chatgpt3.5 turbo. Up to you to believe it or not. But I wouldn’t claim it’s a 20B according to Microsoft Researchers.
The withdrawn paper: https://arxiv.org/abs/2310.17680
The wrong source: https://www.forbes.com/sites/forbestechcouncil/2023/02/17/is...
The discussion: https://www.reddit.com/r/LocalLLaMA/comments/17jrj82/new_mic...