The question is even more complicated than that.
If I had access to see the admin settings on this site I could give a definitive answer but sadly I can not see those settings. Currently for Discourse the only way to see such settings is to be an admin and as I am not an OpenAI employee don’t expect that to happen.
So here is my current understanding, which I am not researching for exact details so some of this may be wrong.
Discourse did not originally have a summuriation ability. Then I think someone created a plugin for it and Discourse liked it so much they either created an official plugin or put it into Discourse.
That is how it worked for quite some time and why I noted the conditions in the other reply and for which you are finding info regrading The discourse forum mentions that it shows up on posts with more than 50 replies which is valid.
However then came the Discourse AI plugin which also has the ability to do summeriation.
As I am finding
on any topic with one reply it seems that this is based on the Discourse AI plugin with summeriation enabled.
Now the Discourse AI can be configured to use different AI for backends including OpenAI. Specifically which one and the settings I do not know.
HTH
@sam.saffron knows but he is busy for the next few days so don’t expect an immediate reply.