If the letter T is OnePlus' way of branding an interim half-generation upgrade, why isn't this latest one named the 5TT? Yes, we're talking about the OnePlus 6, and a quick look at the specs will tell you what we are on about. Still let's not dwell on what hasn't changed and focus instead on what has.
Source: https://www.gsmarena.com/oneplus_6-review-1776.php