In our review of the OnePlus 3T we were in general quite impressed by the device's camera performance and thought the 3T represented excellent value for money. However, video stabilization was a point of criticism as panning could lead to noticeably shaky footage. 
OnePlus claims to have fixed the issue with its OxygenOS 4.1.0 update which is based on Android 7.1.1. and says the performance of the electronic video stabilization is now on the same level as the Google Pixel. Looking at the sample clip we recorded after installing the update we'll have to agree. Stabilization is noticeably improved and panning is now buttery smooth, allowing for very steady hand-held shooting.
Other new features and improvements of the update include the following:
  • Upgraded Android 7.1.1
  • Updated Google security patch to 1st March 2017
  • Added expanded screenshots
  • Improved picture taking of moving objects with blur reduction
  • Improved WiFi connectivity
  • Improved bluetooth connectivity
  • General bug fixes

The over-the-air (OTA) update will be incremental. So if you own a OnePlus 3T and haven't received it yet, don't despair, it should arrive on your device within the next few days.