Something like GPT 5-mini is a lot cheaper than even Haiku but when I tried it in my experience it was so bad it was a waste of time. But it’s probably still more than 1/10 the performance of Haiku probably?

In work, where my employer pays for it, Haiku tends to be the workhorse with Sonnet or Opus when I see it flailing. On my own budget I’m a lot more cost conscious, so Haiku actually ends up being “the fancy model” and minimax m2 the “dumb model”.