He's 1.5"... I've looked at pics of platy/swordtail hybrids and some are similar, but they still seem too rounded. He definitely has a platy-like face and whatnot. The only thing that really stands out is that, in comparison to both the platy/swordtail and just the regular swordtail, my fish has a much, much taller dorsal fin.
I had no idea that this would be such a complicated fish.. I made a good choice haha.