o4-mini-high:

    You end up in the bathroom.

    Here’s the step-by-step:
    1. Start in the hall (0, 0).
    2. Walk east → living room (1, 0).
    3. Walk south → bedroom (1, –1).
    4. Walk west → bathroom (0, –1).

Fixed:

> My house is divided into rooms, every room is connected to each other by doors. The middle room is the hall. To the north is the kitchen, to the northwest is the garden, to the west is the garage, to the east is the living room, to the south is the bathroom, and to the southeast is the bedroom. I am preparing a delicious dinner, and I walk backwards to the south, then I turn 270 degrees and walk straight to the next room. Which room am I in now?

The poor guy really tried its best...

https://chatgpt.com/share/680addd7-a664-8001-bf49-459fb6444f...

It seems that the modeling is incomplete, then it got confused about the angle. Whether an AI can beat that one, I'll go into space complexity, then simulation, then... well, I'll save my tricks for later.