There is a serious problem with Cursor-’s GPT-5 integration, or the reasoning version of GPT-5:
Creating a wrapper around TipTap rich text editor component in React + TypeScript
In cursor:
- GPT-5 high MAX
- 3 x 1.5 minute thinking sessions to make a minor change to a file and it made a simple but critical error where it didn’t inherit something that broke the entire implementation.
In T3 chat:
- GPT-5 (non reasoning)
- I pasted the whole file and the same message
- instantly generated nice output with headers and an explanation of the problem and a complete updated code file that worked fine.
…I thought I was talking to Claude-4 until I checked the model I had set in T3 chat.
…I then switched to GPT-5 low reasoning and it is much faster with no obvious difference in experience or code quality so far (though token stats look about the same as high reasoning in the usage dashboard, and high reasoning took minutes versus seconds)
IMPORTANT: I did this workflow two more times of asking GPT-5 in T3 chat to fix bugs created by GPT-5 in cursor. Amazing output and perfect fixes from T3 chat. Cursor same bad results. Cursor has codebase and tests and rules. T3 chat has nothing but what I copy-and-paste. How can it be so much faster and with Claude-4 level conversational output??