The latest version of Cyanogen OS 12.1 is based on Android Lollipop 5.1.1 ( AOSP ) .
The latest version of Cyanogen OS 12.1 is 12.1-YOG7PAS2K1 based on Android Lollipop 5.1.1 ( AOSP ) , released in January 2016 .
OnePlus One