After setting up opus and sonnet,

we are now entering a period of intense daily development work.
First, we optimize and review all the previous skills.
This part is entirely handled with opus
because it's not a work from 0 to 1,
it's more about detailed optimization.
Therefore, I chose opus.
If you're going to use it, use the best model.
Saving time is saving money.
The key is to avoid detours.