The good news: the 3T won't be playing fast and loose with numbers for much longer. In a statement, OnePlus says that it will stop ramping up the processor for benchmarks in "upcoming" OxygenOS releases for both the 3 and 3T. The company claims that this was part of a broader effort to provide a "better user experience" in demanding apps (particularly games), although that doesn't really pass muster -- there was no reason to be hiking speeds in benchmarks. You can read the full statement below.
OnePlus certainly isn't alone in this behavior, as XDA caught the Meizu Pro 6 Plus cheating at the same time. That doesn't justify rigging tests, however, and it suggests that benchmark makers and testers alike will have to remain extra-vigilant if they want to keep companies honest. It's also a reminder to test phones in real-world circumstances whenever possible -- even when benchmarks are accurate, they can only tell you so much about your day-to-day experience.
"In order to give users a better user experience in resource intensive apps and games, especially graphically intensive ones, we implemented certain mechanisms in the community and Nougat builds to trigger the processor to run more aggressively. The trigger process for benchmarking apps will not be present in upcoming OxygenOS builds on the OnePlus 3 and OnePlus 3T.'"