I have been doing this and the results have been fairly good. I use claude to build requirements.md -> implementation.md -> todo.md. Then I tell opencode + ope

I have been doing this and the results have been fairly good. I use claude to build requirements.md -> implementation.md -> todo.md. Then I tell opencode + openrouter to read those files and follow the todo using a cheap (many times free) model. It works 90% of the time. The other 10% it will get stuck, in which case I revert to claude. That has allowed me to stay on the $20/month claude subscription as opposed to the $100.