Android 6.0.1 Marshmallow is beginning to roll out for the OnePlus One, the company has shared in a post on its own forum. Cyanogen is ready to push the CM 13.0 release with internal designation ZNH0EAS26M to OnePlus’ first ever smartphone.
Found at: http://www.gsmarena.com/oneplus_one_marshmallow_update_now_seeding-news-17686.php