Although the OnePlus X is not manufactured anymore, the company has pushed an update to the OnePlus X devices.
The update features a fix for the crashing launcher, auto-brightness optimization and an improved system stability. Noticable is that the company has also put the November security patch from Android in the update. The update will carry the version ID of OxygenOS 3.1.4. and is being rolled out incrementally from now on.
Source: OnePlus forums