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Same. It's barely even touching the credit I have on openrouter, it's great.

Do you switch model mid session, or do you use subagent to do the switch after planning?

I sometimes switch mid-session. Depends what I’m doing. Sometimes a model is slow or it’s not giving me what I want and I don’t want to dump the context. But if there’s a natural break, I’ll start a new session with a new model.

Neither, I use different sessions for each step.

So your planner leaves markdown files I assume...?

Correct. I customized my harness so agents communicate with each other through markdown files.

I find that it makes coding and review at the same time less prone to errors and cheaper

Those are my two workhorses as well.