API returning 404 model not found all of a sudden. Why and how to fix?

Hi, was working fine, pinging responses, nice little chat interface going, then suddenly it returned this. Changed the model to test but same for both. Have access to them all in playground, card and limits fine, but now returning 404 model not found:

ERROR: Error code: 404 - {'error': {'message': 'The model `gpt-4-turbo-preview` does not exist or you do not have access to it. Learn more: https://help.openai.com/en/articles/7102672-how-can-i-access-gpt-4.', 'type': 'invalid_request_error', 'param': None, 'code': 'model_not_found'}}