Author here! Thanks for pointing that out. The correct model name is indeed "gpt-4" instead of "gpt_model = 'gpt4_20231230_1106preview'". We were previously using an Azure endpoint, which is why the model name is different.

While I understand the frustration, I assure you that the rest of the code is functional. This was a simple oversight and should be a trivial fix. I appreciate your feedback and understanding.