can’t directly answer the question for you, but also been using opus 4.5 found it costly, but well worth the money, best model I’ve used so far, a pleasure to work with. the time and stress it saved compared to trying to save money on other models (i keep trying to do stuff with grok, which is still free, but not in the same league)
also check out the other post on here about the additional free credits you get as you buy the larger tiers, you can make significant savings over pay as you go credits, i believe, but its not well explained by cursor. worth checking out.