I tried GPT-5 in Cursor today and got the same thing - it started reading and thinking and thinking, and it was quite repetitive. It was unexpected. I wrote it off as "maybe the Cursor GPT-5 prompts are not refined yet".
Yeah, I honestly don't believe the hype for GPT-5 at all, although I do believe LLMs are awesome, but it feels still to me like they are chasing, e.g. Anthropic, but something is fundamentally off. I may be wrong, maybe there are some cases where it will perform much better. But it just doesn't seem as solid to me as Claude still.