So it's unknowable how much it cost?

It'd cost ~$250 via API (ie. paying current API pricing per token).

Source: copy pasted the tokens into a chatbot and told it to figure it out.

But hardly anybody pays API pricing and this was made with a sub..

So the cost was zero.

Uh, with some fancy accounting..

I think most people could consider the cost as being whatever percentage of the subscription quota was used multiplied by the cost of the subscription.