Thanks, the issue was indeed not using explicitly the thinking model or they changed something over the weekend -- it's at least on par with Claude now. EDIT:

Thanks, the issue was indeed not using explicitly the thinking model or they changed something over the weekend -- it's at least on par with Claude now. EDIT: clearly better than Claude or any other model that I tried before. I had a bonus benchmark -- add a narrow triangle on the head of the snake that indicates the direction of movement, after a single iteration GPT-5 fixed it whereas Claude could never get the rotation of the triangle right, nor could o3 the last time I tried.