Photoshop CS6 (version 13) shipped in 2012.
In terms of the Cloud version of Photoshop, since CS6 we've had
CC 2015.1 (current)
(Yes, the naming convention is appalling and guaranteed to confuse).
Cloud members have access to all versions from current back to CS6.
More broadly the Cloud refers to all Cloud versions of the apps outlined on the Adobe website.