The highest possible credit score you can get is 850 in every major credit scoring model. Scoring this high is pretty difficult to do. In fact, only 1.6% of Americans had a perfect credit score in 2019.
Research shows that people with the best possible credit score have the following things in common:
No missed payments on their credit report
Low credit utilization ratio (4.1% on average)
Long credit history (oldest account opened an average of 30 years ago)
This further emphasizes the key role of your payment history, credit utilization, and length of credit history in determining your credit health.