And considering the OnePlus 3 and 3T, two phones that are almost each a year old at this point, will see O by the end of 2017, doesn't that mean the OnePlus 5 will also get updated? One can guess that OnePlus will only be able to ship the update only after Google makes the OS available to smartphone makers. Android O, now also known as Android 8.0.0 thanks to the latest beta testing preview, will launch alongside Pixel devices, so those will be the first ones to get it. That means that Android O will most likely see a fall launch, just like Apple's iOS 11.
Now, considering OnePlus' past in delivering updates, it has not been the quickest and the company does not have the best record.
Android O is the latest mobile operating system project developed by Google, and the final stable version should arrive this fall.
If you're interested in getting some additional insight into the OnePlus 5's creation and future prospects from the OnePlus team itself, the Reddit thread is definitely worth browsing. OnePlus' official forum noted that it is now rolling out the OxygenOS 4.5.2 OTA for OnePlus 5 globally.
Hopefully, OnePlus will live up to what it has said this time.