By standard I use Opus 4.7 for every task no matter what it is with Claude. But, because I was reaching almost 90% of the model use and with two days left before refresh I set Sonnet 4.6 for a simple task with my Price analyst agent. And it was kind of painful. It just had to look at an email from a client requesting a quotation, look for the database of our usual values, scope analysis according to the request and it was not the same as with Opus. So, bottom line: not very sure if I can trust lower models with daily tasks where you need to delegate and stay confident it won't require too much iteration on those kinds of requests.