接入 HelloAPI

# HelloAPI 兼容 OpenAI 协议: 用官方 openai SDK, 只改 base_url 即可调 DeepSeek 等模型
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.helloapi.io/v1",
    api_key=os.environ["HELLOAPI_KEY"],
)

# stream=True: 首 token 0.2~0.4s 就开始往外蹦字, 体感最快 (推荐)
stream = client.chat.completions.create(
    model="deepseek-v4-flash",        # 走量档, 更快更便宜
    messages=[{"role": "user", "content": "用一句话介绍 HelloAPI"}],
    stream=True,
)
for chunk in stream:
    print(chunk.choices[0].delta.content or "", end="", flush=True)