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That's the framework of an image board so no text really.

You're ignoring the cost of creating a summary though. Just to summarize your reply, taking out the link and quote:

To 75 words:

Is 267 tokens.

If we're talking GPT4.5, it's $75 per 1M tokens ($0.02). But, 4o might be capable of doing it at $2.5 per 1M tokens ($0.0006).

A thread of 750,000 words is $75 to summarize with GPT4.5 and $2.5 with 4o (half price if you put them on a delay). I don't know which would give the best output. But, things get costly quite quickly. I think you're overlooking that when you are saying summarize a thread because it can't only be one and done as threads are always added to unless you lock it. Then in that case, you're paying to summarize a title and tags based on the 267 token ($0.02 to $0.0006) original post and the subsequent cost to summarize it each time it's added to, or every 20 posts, or another arbitrary number of when to summarize the thread.