Is it true that Codex GPT 5.4 with Extra High thinking effort is worse than with Medium/High thinking effort? If it’s true, that’d be very bad design. 😅

depends on the task you wanna do throwing xhigh at some vanilla stuff will likely lead to over engineering though using it for audit & hard stuff - yields the best results for C++/CUDA code review there is no better model than gpt 5.4 xhigh - opus 4.6 and gemini 3.1 pro preview all miss critical moments