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My own output token ratio is 2% (50% savings on the expensive tokens, I include thinking in this, which is often more). I have similar tone and output formatting system prompt content.

That's actually useful to know and it aligns with what I see (I wrote the cost post)

Yes but with prompt caching decreasing the cost of the input by 90% and with output tokens not being cached and costing more than what do you think that results in?

However output tokens are 5-10 times more expensive. So it ends up a lot more even on price

Even more than that in practice once you factor in prompt caching

I think we still skew back to an insanely high input token ratio when you consider agentic loops. For example, when I see the tools I use do a web fetch or a search or other tool use, it's an incredibly high number of new input tokens.