This is the MSA-0011 S Gundam, a mobile suit that first appeared in the novel Gundam Sentinel.

The S Gundam is a prototype, transformable 4th-generation mobile suit developed and manufactured by Anaheim Electronics. It has an A.I., known as ALICE (Voiced by Romi Park in SD Gundam G Generation series), built into it. ALICE had took controls of the S Gundam over its pilot and protagonist Ryou Roots (Voiced by the late Keiji Fujiwara in SD Gundam G Generation series) numerous times during the New Desides conflict. ALICE, despite being an A.I, was depicted as a 'female' in the novel, and this is the reason why the artwork has the S Gundam depicted as a robot girl.

Gundam Sentinel is belongs to Sunrise and Dai Nippon Kaiga.