Perceived Drop in GPT-5 Quality Over the Last Few Weeks
OpenAI Developer Community
June 1, 2026
Let’s just be straight, there has been a huge drop in quality over the last week or two.
So many updates have been rolling out, I’ve been hoping one of them would fix it but in all honesty, it has got worse.
I’ve used codex daily for months now and today is the first time I gave up and came to the forums simply to see if others were having the same issues.
Simple things that used to be fixed instantly and taking 5 prompts to get right. The OP summed it up perfectly, it tries to do everything other than what you ask it to do in order to solve the problem.
I am a fully signed up member to the Codex fan club, but today it’s been awful.
Discussion in the ATmosphere