The IGSA (Intergalactic Grading System for Androids) provides a good grading system to classify androids.
First Grade Androids - Normal androids, not sentient, follows orders
Second Grade Androids - Normal androids, Sentient, not very complex
Third Grade Androids - Complex Androids, sentient, vaguely simulates emotions
Fourth Grade Androids - Complex Androids, sentient, can use nanotech, feel human emotions
Fifth Grade Androids - Hyper Complex Androids, sentient, extremely intelligent, if their body is destroyed, they can simply upload themselves to another one, meaning that they are almost immortal. Possesses a neural network that expands for a planet or more.
