OnePlus has released the OxygenOS 3.2.6 update for OnePlus 3. The update is available over the air (OTA), and is 40MB in size. The update brings with it bug fixes, along with performance improvements for the smartphone.
Here is a list of everything that you will get with the update as per OnePlus' forum post:
Optimized voice call quality of some IM applications
Improved adaptive brightness performance
Improved camera quality
Fixed occasional green/yellow issue
Optimized white balance
Improved 1080p video recording
Addressed some Bluetooth connection problems for vehicles
Allows third party applications to modify ringtone
Optimized battery consumption when scrolling
Optimized touch accuracy when playing games
Added DozeMode switch in Developer options
Added PocketMode switch in Display settings
Unfortunately, there is no information available when the OnePlus 3 will receive the Android 7.0 Nougat update.