I'm getting the same thing I got with Codex when I tried right now. I give it a command, and it keeps reading files and thinking for 5 min+, this never happens with Claude Code.
Oh I tried codex for the first time last night with gpt-5. It looked stuck twice when it used the grep tool (after working successfully for minute or so), and both times I canceled after seeing no output for more than a minute.
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.