Build a Multi-Model AI Chatbot in 15 Minutes: One API Key for DeepSeek, GLM and Qwen

from openai import OpenAI

MODELS = {
    "fast":     "glm-4-flash",        # permanently free, great for small talk
    "smart":    "deepseek-chat",      # strong all-round model
    "thinker":  "deepseek-reasoner",  # step-by-step reasoning
    "writer":   "qwen2.5-72b",        # long-form generation
    "coder":    "deepseek-v3",        # coding tasks
}

client = OpenAI(
    base_url="https://yingsuan.top/v1",
    api_key="YOUR_YINGSUAN_API_KEY"
)

class MultiModelChatbot:
    def __init__(self, api_key: str):
        self.client = OpenAI(
            base_url="https://yingsuan.top/v1",
            api_key=api_key
        )
        self.model_key = "fast"
        self.history = []

    def switch(self, model_key: str):
        if model_key not in MODELS:
            raise ValueError(f"Unknown model: {model_key}")
        self.model_key = model_key

    def chat(self, user_msg: str) -> str:
        self.history.append({"role": "user", "content": user_msg})
        response = self.client.chat.completions.create(
            model=MODELS[self.model_key],
            messages=self.history
        )
        reply = response.choices[0].message.content
        self.history.append({"role": "assistant", "content": reply})
        return reply


bot = MultiModelChatbot(api_key="YOUR_YINGSUAN_API_KEY")

# Casual chat on the free fast model
print(bot.chat("Hi! Introduce yourself in one sentence."))

# Switch to a reasoner for a hard question
bot.switch("thinker")
print(bot.chat("A train covers 120 km in 90 minutes. Average speed in m/s?"))

import OpenAI from "openai";
import readline from "node:readline/promises";

const MODELS = {
  fast: "glm-4-flash",
  smart: "deepseek-chat",
  thinker: "deepseek-reasoner"
};

const client = new OpenAI({
  baseURL: "https://yingsuan.top/v1",
  apiKey: process.env.YINGSUAN_API_KEY
});

const rl = readline.createInterface({ input: process.stdin, output: process.stdout });
const history = [];
let active = "fast";

console.log('Chat ready. Type "/model smart" to switch, "exit" to quit.');

while (true) {
  const input = await rl.question("you> ");
  if (input === "exit") break;

  if (input.startsWith("/model ")) {
    const key = input.split(" ")[1];
    if (MODELS[key]) { active = key; console.log(`switched to ${MODELS[key]}`); }
    continue;
  }

  history.push({ role: "user", content: input });
  const res = await client.chat.completions.create({
    model: MODELS[active],
    messages: history
  });
  const reply = res.choices[0].message.content;
  history.push({ role: "assistant", content: reply });
  console.log("bot>", reply);
}
rl.close();