Using Advisor [1], you can use Sonnet most of time; Sonnet can handoff work it can't handle to Opus. When Opus is done, you automatically go back to Sonnet.
[1]: https://www.mindstudio.ai/blog/claude-code-advisor-strategy-...
So with the stock sonnet i get the chatty confidently wrong sonnet instead of a strict crafted agent. Stock Opus is a lot more reasonable, and hands off simple tasks to crafted sonnet agents with the chatty and more strict workflows, so i guess im literally doing the opposite(closer to what that old article describes).
I hit my weekly limit around day 4, with 2 maxed out windows per day (and sometimes a bit of usage at night).
I completely understand why people would use Opus for everything, it’s much more thorough and effective. Sonnet as well, but on Pro it’s gonna be Haiku all the time.
I have a pretty nailed down .claude/ where the goal is single sources of truth, so agent md files all reference the relevant files for what domain they are working within with that domain's conventions and structure etc, i think keeping this stuff up to date is massive compounding context savings, as well as just better for performance because it keeps all agents context windows free of noise by helping them only load in what is actually needed.
I've never really messed with haiku for anything besides absolute low end repetitive tasks, its usually an agent i have crafted when i want to ask it to generate a bunch of seed data or generic questions for tests or something similar. My assumption is that it would just be terrible and even though its super cheap, it is still inevitably bringing the final results back to the better models and if thats not valuable tokens then im wasting the haiku tokens and the passoff to the better models with work that will be repeated anyway.