Error code: 500 | 400 Unable to access model gpt-4o-mini.

[Unrectified]

I got the simplest code possible with api, I just got a fresh and new API key, but I get this error:

"error : Error code: 500 - {'requestId': 'ebc099bf-7562-452d-854c-c44e6d0c7b5a', 'statusCode': 500, 'timestamp': '2024-10-01T15:31:02.168Z', 'path': '/chat/completions', 'message': '400 Unable to access model gpt-4o-mini. '}"

Here my code:
`base_url = "https://api.aimlapi.com"
api_key = "94aa0232a914485591fba8ab561e7485"
system_prompt = "You are a travel agent. Be descriptive and helpful."

api = OpenAI(api_key=api_key, base_url=base_url)

Voici la cog nommée "Tests" avec sa classe correspondante

class Tests(commands.Cog, name="tests"):
def init(self, bot) -> None:
self.bot = bot

@commands.hybrid_command()
async def test_openai(self,ctx,question:str):
    user_prompt = question
    await ctx.defer()
    try:
        completion = api.chat.completions.create(
            model="mistralai/Mistral-7B-Instruct-v0.2",
            messages=[
                {"role": "system", "content": system_prompt},
                {"role": "user", "content": user_prompt},
            ],
            temperature=0.7,
            max_tokens=256,
        )

        response = completion.choices[0].message.content

        print("User:", user_prompt)
        print("AI:", response)
        await ctx.send(f"user : {user_prompt}\nAI : {response}")
    except Exception as e:
        await ctx.send(f"error : {e}")`

Is there any way to fix it?
Rgds