如何选分组：同一个模型，线路和价格怎么取舍

import os
from openai import OpenAI, APIConnectionError, APIStatusError

primary = OpenAI(base_url="https://open.tutujin.com/v1", api_key=os.environ["TUTUJIN_KEY_PRIMARY"], timeout=60)
backup = OpenAI(base_url="https://open.tutujin.com/v1", api_key=os.environ["TUTUJIN_KEY_BACKUP"], timeout=60)


def chat(messages, model="gpt-5.4-mini"):
    try:
        return primary.chat.completions.create(model=model, messages=messages)
    except APIStatusError as e:
        # 400、401、403 是请求或账户的问题，换线路也解决不了
        if e.status_code < 500 and e.status_code != 429:
            raise
    except APIConnectionError:  # 包括超时
        pass
    return backup.chat.completions.create(model=model, messages=messages)