I don’t totally blame him for prioritizing himself and this person he’s gained an affection for over this woman who he really doesn’t know anything about and doesn’t even reveal the particulars of her situation till towards the end of the movie.

I suppose that part of what complicates this is the framing device. Namely in that because both Ava & Kyoko are androids, part of the question being asked here, with regards to how Caleb relates to them, is “Does he actually see them as being people?”.

The thing that leads us to question that (at least according to Shaun), is that he doesn’t even seem to contemplate saving Kyoko. It would be one thing if he did so, and still came to the conclusion of only saving Ava, and moreover the screenplay would presumably include a scene where we see him contemplate that directly. The issue (again according to Shaun, I have not seen the movie recently) is that he doesn’t at all.

I agree, but I also think he’s in an emotionally stressful situation engineered by a man much more powerful (physically and socially) than him.

That is somewhat fair tho; and actually something that I don’t think people do bother to consider all to closely when thinking about how Caleb acts.

I also agree, but would like to add that when I was watching, I had the belief that everything Kyoko was doing was actually planned by Nathan seeing as she seems to be completely following his commands. Throughout the film Nathan had shown he is willing to go to great lengths to fuck with Caleb, would making an android act strange be out of character? I was even sure Nathan was faking being drunk. So its already a massive risk to try save Ava who could just be playing with him all along, if he tried to save Kyoko as well there’s potential she sabotages their plans if she is actually doing Nathan’s bidding.

I can also understand why people came away from the film thinking Ava may actually be manipulating Caleb because she does not give a shit about any of the characters dying. She especially shows no reaction to Kyoko’s death, instead she is out acting like nothing even happened. A being who sees an enslaved comrade get murdered and doesn’t react is kinda frightening. I personally don’t think Ava was manipulating Caleb, but I’m not going to rule out that interpretation since the film does not.