you'll feel a major difference between 4.5 haiku and 4.5 sonnet. but there are lot of tasks that haiku is more than enough for. Let's say, I wanted to get a simple github repo working on my local system -- that's a token burner but I believe haiku will help you in 90% of the cases (where sonnet is at 98-99% now).
yes
The '3x cheaper' Haiku 4.5 for agents, as you mentioned, is a brilliant pivot, though I'm curios if the reall-world performance matches the hype.
you'll feel a major difference between 4.5 haiku and 4.5 sonnet. but there are lot of tasks that haiku is more than enough for. Let's say, I wanted to get a simple github repo working on my local system -- that's a token burner but I believe haiku will help you in 90% of the cases (where sonnet is at 98-99% now).