However, how will we be able to recognise it when we do create something that could be considered sentient? It seems inevitable that we will at some point.
Many of the arguments used to suggest AI isn't sentient seem reductive, for example saying it's just a complex algorithm or statistical system. You could similarly say human brains are just a bunch of neurons firing in sequence to emulate sentience.
In terms of capability, most of these systems seem far more advanced than my pet rabbits, but I believe most people would consider a rabbit conscious and sentient. The obvious thing these AIs lack compared to animals is objective (/emotions), a default mode network, continual learning and medium/long term memory. But are these necessary properties for sentience? If a human loses one of these properties, are they no longer sentient? If we granted these properties to a current generation AI, would it be considered sentient?