Building a Custom ChatGPT Assistant

First, let's create a new Next.js project and install the necessary dependencies...

npx create-next-app@latest chatgpt-assistant --typescript
npm install openai@^4.0.0

Now we'll set up our OpenAI API configuration...

import OpenAI from 'openai';

const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY
});