How to code efficiently and not so expensive?

In total, 6-8 hours of coding through the agent and the limits on pro plus in cursor have ended.. The project is small, the type is not tens of thousands of lines of code, and it turns out to be expensive to develop..

What should I do, how can I still use claude opus 4.5, sonnet 4.5 and not spend so much money?

What language are you trying to program in?

python, js

Is Claude the only models you’re using?

yes