An organism's purpose is to be the reason for its own continued existence, down to every molecule and pathway. I bought my laptop for $499 and it runs models... let's not delude ourselves into thinking this is the same kind of problem.

We can design learning algorithms to optimize some survival function, but it's just a label WE assign to map some numeric observations. In the real world, it's always the other way around. The "labels" are electrochemical situations that are causally and inextricably linked to the real body.

An organism discriminates between what's good for it and what's bad, because it is essential for its continued survival. If it wasn't capable of making this distinction through its physiology, it would quickly dissolve into entropy. So our functional purpose, unlike that of a learning algorithm, is survival across indefinite timeframes.

Even a single-cell organism like Stentor coeruleus exhibits learning (pavlovian conditioning) by attaching chemical tags directly to proteins involved in mechanoreception. It's definitely not conscious, but it does keep a record of consequences, which affects future behavior.

When we move up to placozoans (little more than slightly differentiated cell mats), we start seeing our first neuropeptides and transmitters, which we still use today. These peptides are a way of coordinating the entire organism for a specific purpose, such as moving, eating, mating ... basically goal-oriented behavior for the purposes of surviving acrosss various time scales (next minute, next hour, next generation). Still probably not conscious.

Next, we have the water bear (tardigrade), which has around 1000 cells (200 neurons, 800 other cells that make up its body, limbs, muscles, eye spots, cryobiotic machinery). It needs to integrate all this information in one sensorimotor process. When you shine a bright light onto a tardigrade, it starts to squirm around until it finds darkness. I would say that's a candidate subject right there.

The tardigrade itself doesn't actually need to aware of the light, the important thing is that this light becomes an aversive condition within the sensorimotor process, which is perceived from inside the process as displeasure. The closest thing to describe it would be the felt badness of the current condition and the bodily pull toward escape.

If we were to try and create digital consciousness, then it probably needs causal closure. Its internal states can't be representations that are detached from reality. The states themselves need to constitute the system, which needs real stakes in the material world.