How to Build a WhatsApp AI Chatbot in 10 Minutes Using Python + GPT-4

I built a complete WhatsApp AI chatbot that answers questions, captures leads, and takes orders — all powered by GPT-4. Here's the full tutorial.

What You'll Build

A fully functional WhatsApp bot that:

• Connects to WhatsApp via QR code scan (no API approval needed)
• Uses GPT-4 to answer customer questions naturally
• Captures leads and stores them
• Takes simple orders via WhatsApp
• Runs 24/7 on any server

Why WhatsApp?

WhatsApp is the #1 messaging app in Latin America, Europe, and many other markets. Small businesses lose customers because they can't respond fast enough. An AI bot solves this problem instantly.

Prerequisites

• Python 3.10+
• An OpenAI API key
• A phone to scan the QR code (one-time setup)

Step 1: Install Dependencies

pip install openai python-dotenv

Step 2: Configure Your Bot

Create a .env file:

OPENAI_API_KEY=sk-your-key-here

Step 3: The Bot Logic

Here's the core of the bot — a simple Python script that bridges WhatsApp and GPT-4:

import openai
from dotenv import load_dotenv
import os

load_dotenv()

client = openai.OpenAI(api_key=os.getenv("OPENAI_API_KEY"))

def generate_response(user_message: str, chat_history: list) -> str:
    messages = [
        {"role": "system", "content": "You are a helpful business assistant."},
    ]
    messages.extend(chat_history[-10:])
    messages.append({"role": "user", "content": user_message})

    response = client.chat.completions.create(
        model="gpt-4o-mini",
        messages=messages,
        max_tokens=500,
        temperature=0.7
    )
    return response.choices[0].message.content

Step 4: Connect to WhatsApp

The bot uses a Node.js bridge that connects to WhatsApp Web:

const { default: makeWASocket } = require('@whiskeysockets/baileys');

async function main() {
    const sock = makeWASocket({});
    sock.ev.on('messages.upsert', async ({ messages }) => {
        for (const msg of messages) {
            if (msg.message && !msg.key.fromMe) {
                const response = await fetch('http://localhost:5000/chat', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ message: msg.message.conversation })
                });
                const data = await response.json();
                await sock.sendMessage(msg.key.remoteJid, { text: data.response });
            }
        }
    });
}
main();

Step 5: Run It

python wa_bot_builder.py
node whatsapp_bridge.js

Scan the QR code with your WhatsApp phone, and you're live!

Features

Get the Complete Code

I've packaged the entire working bot with documentation (Spanish included), configuration wizard, and deployment guide.

Get it here: https://wa-bot-builder.manus.space

Only $9 — cheaper than a coffee, and it keeps working 24/7.

Also offering a setup service where I install and configure the bot on your server for $20 — delivered in 24 hours. DM me!