I am just a fellow user, but here are answers to some questions.
Based on the information on the Pricing page:
https://www.cursor.com/pricing
This is what you get with Pro:
Unlimited completions
500 fast premium requests per month
Unlimited slow premium requests
Unlimited cursor-small uses
10 Claude Opus uses per day
Business is everything in Pro, plus the following:
Centralized billing
Admin usage dashboard
Enforce privacy mode
OpenAI zero-data retention
The premium models are:
GPT-4, GPT-4o, and Claude 3.5 Sonnet.
As a pro user, you get 500 fast/priority requests using these models per month.
‘Fast’ just means those requests are put first in the queue.
Further clarification on what ‘fast’ means is here:
FYI - GPT-4o-mini is treated as a non-premium model:
I personally just toggle to GPT-4o-mini when I am doing smaller stuff.
Hopefully the Cursor folks can help you with the other queries.