Android 14 for OnePlus 9

syaoran wrote:

It is up to OPPO, the owner of the OnePlus brand to deliver it.  My OnePlus 8T has Android 14, as bad as it is basically being ColorOS under the name of OxygenOS.  

Once the manufacturer, in this case OnePlus/OPPO, finishes developing the OS update it's up to the carriers when and if they decide to actually push it to their customers after testing for bugs. If you had bought it directly from OnePlus, then it would be the sole responsibility of the manufacturer.