I'm the same way re: bottoming out my 20x Max plan in ~2 days. I'm having better luck lately, though. What helped was using Opus 5.5 for planning and orchestration, and Haiku 5.5 for all of the simple stuff. Claude doesn't default to this -- the default is that it uses the same model for everything -- you have to give it specific instructions.

My math takes that into account. It's 20x more expensive but you get 60x subsidy on subs. I.e you can do more tasks on a $20 claude sub than with $20 in deepseek API.