OnePlus has begun rolling out a new OxygenOS 16 update for the OnePlus 13 that brings a meaningful tweak to how the phone handles charging under load, along with some other additions.
According to a post on the OnePlus Community forum, OxygenOS 16.0.3.501 is rolling out in batches to Indian models first. This is typical of OnePlus OTA releases, which usually start in one region before expanding more widely once any early issues are ironed out.