I think it will depend on who is supplying the report. You can download general information for your car based on year/model from the GM Heritage Center. For $50 you can get a digital copy of the original dealer invoice which shows options and the dealer it was originally shipped to. I'm not sure what year car you own, but accident data was not generally available outside insurance companies in the '80s. By the '90s some of that information was being collected and shared so it may be available. If you can find out who serviced the car there's a chance some of the maintenance records ara available through the dealership. And sometimes you will be asked to submit photos and you will get a very nice, detailed appraisal.

Unfortunately I've seen some pay-for "classic car reports" that are just a collection of free information so you might want to ask the supplier for a sample before ordering anything.

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For classics the reports can be hit or miss since older records aren’t always digital, but you can usually expect basics like title history, ownership changes, odometer readings, accident records if they were ever reported, and sometimes auction history. Maintenance is a little less consistent unless it was done at shops that actually logged it into databases, but bigger repairs, recalls, or insurance claims tend to show up. What I’ve found helpful is to look closely at ownership length (a car passed through a lot of hands fast is usually a red flag) and any salvage or rebuild branding. If you’re restoring, the history can give you a sense of how original the car is and whether it’s worth putting money into. I’ve seen folks share reports on @detailedvehiclehistory Instagram and that’s how I came across them myself while scrolling another forum, they sometimes include older data and even auction photos which is useful for spotting hidden issues before you dive in.