Python Chatgpt API不断返回错误：404未能从API获取响应

我正在使用ChatGPT的API执行文本分类任务，我上传数据集并要求ChatGPT决定我的文本是否与房地产有关.我的代码是:

基本设置

import json
import requests
from os import getenv

# Load JSON data from file
with open('/policy_cleaned.json', 'r', encoding='utf-8') as file:
    data = json.load(file)

# API settings
api_url = "https://api.openai.com/v1/completions"
headers = {
    "Content-Type": "application/json",
    "Authorization": f"Bearer sk-proj-...1u"
}

API函数

def classify_text(text):
    prompt = f"Classify the following text whether it is related to the Chinese real estate industry, and if it is specifically about Chinese real estate policy: {text}"
    payload = {
        "model": "gpt-4-turbo",  
        "prompt": prompt,
        "max_tokens": 64,
        "temperature": 0.1
    }
    response = requests.post(api_url, headers=headers, json=payload)
    if response.status_code == 200:
        result = response.json()
        return result
    else:
        return {"error": "Failed to get response from API", "status_code": response.status_code}

在我的数据集上运行并输出响应

results = []
for item in data:
    classification = classify_text(item['CleanedContent'])
    results.append({
        "PolicyID": item['PolicyID'],
        "Title": item['Title'],
        "Classification": classification
    })

with open('classified_data.json', 'w', encoding='utf-8') as file:
    json.dump(results, file, ensure_ascii=False)

程序在返回的SON文件中不断返回:

{"error": "Failed to get response from API", "status_code": 404}.

我是一个使用这个的新手，所以我迫切需要任何帮助！