There are 4 generations of Xbox, and 9 main models if you exclude retail configurations. Below you'll see the 4 main generations (in bold) and their models. Original Xbox (2001 - 2009) Xbox 360 (2005 - 2016) Xbox 360 S (2010 - 2016) Xbox 360 E (2013 - 2016) Xbox One (2013 - 2016) Xbox One S (2016 - Present) Xbox One X (2017 - 2020) Xbox Series X (2020 - Present) Xbox Series S (2020 - Present)