The API quota is charged, Tier1 is reached, but GPT4 can not be invoked

I successfully recharge in the official website, and show the access to call the GPT4 model, why run-time or error no access or model does not exist?

Code:
import os
from openai import OpenAI

os.environ[“OPENAI_API_KEY”] = “”

client = OpenAI()

completion = client.chat.completions.create(
model=“gpt-4”,
messages=[
{“role”: “system”, “content”: “hi”},
{“role”: “user”, “content”: “hello?”}
]
)
print(completion.choices[0].message)

error:
openai.NotFoundError: Error code: 404 - {‘error’: {‘message’: ‘The model gpt-4 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’}}
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