Error running main.py when testing "Create Agent from Scratch"

Hi, 

Do I need to use the paid version of chatgpt, gpt-4, so as to run main.py successfully?

I created my API Key in GPT-3.5. I tried testing your agent code on "How to create AI Agents from scratch with Python".  When I ran python main.py, I got the error excerpt below:
 
raise self._make_status_error_from_response(err.response) from None
openai.NotFoundError: Error code: 404 - {'error': {'message': 'The model `gpt-4` does not exist or you do not have access to it.', 'type': 'invalid_request_error', 'param': None, 'code': 'model_not_found'}}

When I changed the model in your code to gpt-3.5-turbo and ran python main.py, I got the error excerpt below:

raise self._make_status_error_from_response(err.response) from None
openai.RateLimitError: Error code: 429 - {'error': {'message': 'You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors .', 'type': 'insufficient_quota', 'param': None, 'code': 'insufficient_quota'}}

Thank you