Two major OS updates will be available for the OnePlus Nord and Nord CE devices, as well as three years of security fixes. One Android OS update and three years of security patches are planned for the Nord N line of smartphones. Prior to the OnePlus 8 series, OnePlus flagships would continue to receive two Android OS updates and three years of security patches.
Three OS updates and 4 years of security updates
OnePlus 9 Pro
OnePlus 9R
OnePlus 9
OnePlus 8T
OnePlus 8 Pro
OnePlus 8
Two OS updates and 3 years of security updates
OnePlus 7 Pro
OnePlus 7T Pro
OnePlus 7T
OnePlus 7
OnePlus Nord CE
OnePlus Nord
One OS update and 3 years of security updates
OnePlus N200 5G
OnePlus N100
OnePlus N10 5G
The new post also indicates that starting with Android 12, the OxygenOS and ColorOS codebases will be merged.