A few months ago, before the launch of the OnePlus 5, OnePlus canceled sales of the OnePlus 3T. Fans of the OEM were leery but no information actually pointed towards the cancellation of support for the device. OnePlus, yesterday, in a post on the official forum, has announced that Android O will be the last major OS update the OnePlus 3/3T gets.
"Android O is going to be the last Android version update we’ll release for OP3/3T. We’ll continue to release security patch updates for the foreseeable future, and offer support for individual application updates," a company rep said. "After the OP3/3T have been updated to Android O, we’ll start moving the Open Beta Program from OP3/3T to OP5."
Considering the OnePlus 3T was released less than a year ago, this comes as a big blow to users, as a year of support is lacking for an OEM like OnePlus. The OnePlus 3T released with Marshmallow but Nougat was out already by that point, so this feels like a loophole being exploited by the company.
While O will be the last major update, both devices will continue to get security patches. You can also keep up with Android releases by installing third-party ROMs like Lineage OS. That's a solution, albeit one OnePlus shouldn't have to push users to resorting to.