Interestingly I'm experiencing the opposite as you. Was mostly using Claude Sonnet 4 and GPT 4.1 through copilot for a few months and was overall fairly satisfied with it. First task I threw at GPT 5, it excelled in a fraction of the time Sonnet 4 normally takes, but after a few iterations, it all went downhill. GPT 5 almost systematically does things I didn't ask it to do. After failing to solve an issue for almost an hour, I switched back to Claude which fixed it in the first try. YMMV
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Interestingly I'm experiencing the opposite as you. Was mostly using Claude Sonnet 4 and GPT 4.1 through copilot for a few months and was overall fairly satisfied with it. First task I threw at GPT 5, it excelled in a fraction of the time Sonnet 4 normally takes, but after a few iterations, it all went downhill. GPT 5 almost systematically does things I didn't ask it to do. After failing to solve an issue for almost an hour, I switched back to Claude which fixed it in the first try. YMMV
Yeah, GPT 5 got into death loops faster than any other LLM, and I stopped using it for anything more than UI prototypes.