Alien Isolation as everyone is saying, for obvious reasons. Zelda botw is great as well, but here's my pick.

This is the best A.I. I've ever seen in a video game:

Rain World

Rain world us a survival action platformer. You control a slugcat and brave an extremely Hostile and unforgiving world. The game simulates a real word ecosystem, and you are near the bottom of the food chain.

Enemies are always loaded and doing things in the world, this allows you to stumble upon an interaction that has just finished, is partway through, or just the aftermath. Some creatures creatures will run when scared or hurt, but some of those creatures in the same species will be a little more brave (or stupid) and advance anyways. Nothing is scripted and the creatures all use procedural animation, as well as the slugcat.

The true king of the AI in the game though, is the scavengers. Monkey-like creatures who form packs and small societies. Capable lf doing everything the slugcat can and more. They are extremely well animated, showing emotion when they're scared, angry, curious, or sad. They have a reputation system that allows you to befriend them or become mortal enemies. Kill scavengers, steal from them, etc and they will hate you so much that they will send out hunting parties to kill you. Give them gifts, save them from creatures, etc, and they will love you, giving you gifts and following you around. Scavengers have personalities, some are timid and will run from you if they don't know you. Some are just assholes and pelt you with rocks. This is just scratching the surface, it is incredible.