Very very rare – AI can be created by two pathways – one, through complex Warding which produces fairly limited AI – this process is discouraged as it is viewed to be cruel.
The Mandate are able to create AI by copying the mind-state of a (hopefully) deceased individual.
The later can only interact with a ship’s computer systems but cannot interact with wards. A major exception is Corde, who, although being a Mandate AI, is somehow able to interact with a ship’s warding.
Corde was an ex-Mandate AI, modified by the Antian Empire.