After the usage syncing issue fix (and maybe that same week before that fix), I see noticeable degradation in prompt response quality. I know this is subjective and I don’t have solid empirical evidence to show you but the main pattern I am seeing consistently now is its clear inability to adhere or follow the instructions given and at times it seems to eagerly declare an outcome or a patch but it is incorrect or the code quality is bad enough to cause major regressions.
My prior impression of GPT 5.5 was that it would be able to fix issues very well. I don’t think the codebase has changed or my workflow has been altered. I am primarily working with Flutter nad Xcode and it seems that it has gotten suddenly incapable of one shotting prompts even for the simplest UI changes which is uncharacteristic of its prior performance.
I see several other mentions of this across social media so I can’t be alone in observing these noticeable delta over time. My biggest issue is that using GPT 5.5-med causes the most regressions and coding issues whereas before I never had to reach beyond it to work on UI tasks. Using GPT 5.5-high is also not giving me really noticeable uplift. In desperation I have resorted to using GPT 5.5-xhigh but I notice still that it is not running as long as it used to. Previously xhigh would run for hours and amazing at fixing issues even while I pack them into the prompt. Now it does not seem as capable.
I am also observing some changes to ChatGPT Pro models as well. Previously it would think for very long period of time and rarely would it respond quicker than 10 minutes but now I see that it is responding much more quicker and often with less material attached.
Hoping these issues can get some attention and investigation.
After the usage syncing issue fix (and maybe that same week before that fix), I see noticeable degradation in prompt response quality. I know this is subjective and I don’t have solid empirical evidence to show you but the main pattern I am seeing consistently now is its clear inability to adhere or follow the instructions given and at times it seems to eagerly declare an outcome or a patch but it is incorrect or the code quality is bad enough to cause major regressions.
My prior impression of GPT 5.5 was that it would be able to fix issues very well. I don’t think the codebase has changed or my workflow has been altered. I am primarily working with Flutter nad Xcode and it seems that it has gotten suddenly incapable of one shotting prompts even for the simplest UI changes which is uncharacteristic of its prior performance.
I see several other mentions of this across social media so I can’t be alone in observing these noticeable delta over time. My biggest issue is that using GPT 5.5-med causes the most regressions and coding issues whereas before I never had to reach beyond it to work on UI tasks. Using GPT 5.5-high is also not giving me really noticeable uplift. In desperation I have resorted to using GPT 5.5-xhigh but I notice still that it is not running as long as it used to. Previously xhigh would run for hours and amazing at fixing issues even while I pack them into the prompt. Now it does not seem as capable.
I am also observing some changes to ChatGPT Pro models as well. Previously it would think for very long period of time and rarely would it respond quicker than 10 minutes but now I see that it is responding much more quicker and often with less material attached.
Hoping these issues can get some attention and investigation.
Same feeling to me. I use GPT 5.5-xhigh, it didn’t perform as well as last week, especially with long tasks, frequent errors, and not following the workflow.
I am having a similar experience this morning. Very long turns for simple queries and when it derails and you interrupt/steer, its just ignoring the commands. If you do manage to interrupt, it still ignores what has been said and carries on from its previous plan. Something has changed here since last week.
Same to me. I feel codex become much slower these several days, and always stuck during the task. It’s very frustrating to wait for a long time and find there is not any progress.
I completely agree. It wouldn’t be meaningless to say that GPT-5.5 currently behaves like 5.3. It couldn’t solve even a very simple task I gave it, despite me repeating the request 15-16 times and providing different perspectives. When working on the project, it acts irresponsibly. In the first days, it worked incredibly effectively, but now it strangely feels as if it has been downgraded.
However, it is not entirely bad. It is still a very good and powerful model. But there is no trace left of the extraordinarily impressive model we saw in those first days.
This is still happening to me. Codex frequently gets stuck in the Thinking state at different points during the workflow, especially at the very beginning of a new thread, without showing any feedback or progress for a long time. Sometimes it does eventually work, but the speed is unbearably slow, even for simple tasks. I’ve been experiencing this issue since last Saturday.
At this very moment, the issue still persists. Codex is not merely slow; it repeatedly becomes stuck in the middle of tasks, showing no progress even after prolonged waiting, which is truly exasperating.
Apologies for the inconvenience. Can anyone of you please submit a support request at support@openai.com. I am requesting this since we need some personal details like session id, etc. We cannot take those details here in public forum. So if you open a request please include:
Reproduce the issue in a new chat on codex, right click and copy the session id.
do a /feedback and share the details of the issue there.
Once done, please share the session id in the support request and a short summary of the issue. After submitting the support request please share the case id/case subject here so our team can track and troubleshoot the issue for you. Thanks again for flagging it!
I completely share this ‘opinion’ or experience. I started using 5.4 again for extended thinking, and 5.3 Codex for the code (only using 5.5 for simple tasks like GUI changes, as it is faster).
There is also a Reddit topic discussing the exact same findings.