GPT-4o Model Access and Emotional Audio Voice Generation in Python?

A few hours ago I bought access to GPT-4o
since I wanted to test out emotional audio outputs.

I can’t find an example for this,
but this example was generated for creating emotional text:

from openai import OpenAI

client = OpenAI( api_key = os.getenv('openAiApiKey')  )

models = client.models.list()

prompt = "Tell me a story about a brave knight."
emotion = "joyful"  # You can change this to any emotion like 'sad', 'angry', 'excited', etc.

emotional_prompt = f"Respond with a {emotion} tone: {prompt}"

response = client.completions.create(
    model="gpt-4-turbo",  # Use the model you have access to


However I am getting the following error:

openai.NotFoundError: Error code: 404 - {'error': {'message': 'The model `gpt-4-turbo` does not exist or you do not have access to it.', 'type': 'invalid_request_error', 'param': None, 'code': 'model_not_found'}}

My billing dashboard states the payment went through. Does the OpenAI API take a few hours or days to process the billing update? Does anyone have a simple example for input text to emotional voice audio outputs?

Thank you.