[sa-code]

There was a paper published by Microsoft that seemed to leak this detail. I'm on mobile right now and don't have a link but it should be searchable

[nl]

The paper was https://arxiv.org/abs/2310.17680

It has been withdrawn with this note:

> Contains inappropriately sourced conjecture of OpenAI's ChatGPT parameter count from this http URL, a citation which was omitted. The authors do not have direct knowledge or verification of this information, and relied solely on this article, which may lead to public confusion

(the noted URL is a just a Forbes blogger with no special qualifications that would make what he claimed particularly credible).