You would be surprised how much code haiku writes behind the scenes. With the whole 'plan w/ opus, spawn subagents w/ haiku' that cc does. And you'd be surprised how useful the small models can be under some guidance / hand holding. You can daily-drive gpt5-mini and still find it useful. They're not as good as the big ones, obviously, and can't handle a project start-to-finish on their own, but given a well-scoped task, they'll do it just fine.