How can I access chatgpt4?

I bought chatgpt4 and I have the API key. But when I want to use it I have this error :
" raise self._make_status_error_from_response(err.response) from None
openai.NotFoundError: Error code: 404 - {‘error’: {‘message’: ‘The model gpt-4-0613 does not exist or you do not have access to it. Learn more:’, ‘type’: ‘invalid_request_error’, ‘param’: None, ‘code’: ‘model_not_found’}} "

this is a part of my code :
response =
{“role”: “system”, “content”: “You are a helpful assistant.”},
{“role”: “user”, “content”: prompt},

what should I do ?

What is your usage tier?

(it says it at the top, next to the title)

If you’re in the free tier, you might not have access

Paying for chatgpt doesn’t count towards your API spend, it’s completely separate.