The message you're encountering suggests that the 'gpt-5.3-codex' model is not available for use with a ChatGPT account when using Codex. This could be due to a variety of reasons such as the model not being released yet, being restricted to certain users or regions, or technical limitations. It's not necessarily that only you are facing this issue; others might be experiencing similar problems if they are using the same setup or if there is a broader issue with the service. To resolve this, you might want to check for any updates or announcements regarding the availability of the 'gpt-5.3-codex' model, contact support for assistance, or look for alternative models that might be available through your account. Additionally, ensure that your software and API keys are up to date, as sometimes these issues can be resolved with a simple update. If the problem persists, it might be worth discussing the issue in relevant forums or communities to see if others have found workarounds or if there is a known issue that needs to be addressed by the service provider.

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