There are three differences between the OZMO 920 and the 950.
1. The OZMO 950 has a bigger internal battery, and can run up to 200 minutes on one charge. The OZMO 920 runs for 110 minutes.
2. With the larger battery, the OZMO 950 has three levels of suction: Normal, Max and Max Plus. The OZMO 920 has just Normal and Max.
3. The third difference is the OZMO 950 has a matte black finish, and the OZMO 920 has a glossier black finish.