With the recent release of OpenAI open weight models, gpt-oss, there are many related moving parts to track, especially if you are trying to resolve a bug or similar.
Remember to, or consider checking the GitHub OpenAI repositories for any commits or new repositories before asking a question. OpenAI may have pushed an update for that.
Also remember that the OpenAI Cookbook is also a repository so if a recipe in the cookbook seems wrong, also take a look at the GitHub OpenAI Cookbook repository recent commits.