Currently, the highest MMR calibration possible in Dota 2, in a completely fresh account, after the required games to unlock ranked play, is 6k MMR, meaning that the cap of 3.5-4k that has been around for a long time is no longer valid, if you are good enough, as many pros do, you could calibrate your account directly

How do I calibrate my high MMR in Dota 2 2020?

How to calibrate your new Dota 2 account:Play 100 matches first (Normal or Turbo).Then the Ranked section will unlock.To get your Dota 2 rank, you have to complete some requirements again.Complete one of the two options: 10 solo calibration matches or 10 party calibration matches.More items

How does calibration work in Dota 2?

After playing 100 hours of Dota 2 and linking a phone number to your account, youll need to play 10 calibration matches. Youll unlock your first medal after these matches and your unranked performance will also be factored in while calibrating in Ranked.