Integrating Claude API for Smart Applications

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Tutorial Intermediate ⏱ 45 min read © Gate of AI 2026-06-21

Learn how to integrate Claude and ChatGPT APIs into a smart application using modern SDKs for enhanced AI functionalities. Note: OpenAI’s access to Claude API has been revoked.

Prerequisites

  • Node.js version 18.0 or later
  • Access to Anthropic API key
  • Intermediate JavaScript and React knowledge

What We’re Building

In this tutorial, we will build a smart application that leverages the capabilities of both Claude and ChatGPT APIs. However, due to recent changes, OpenAI’s access to Claude API has been revoked. We will focus on integrating Claude API for tasks such as language translation, sentiment analysis, and providing conversational responses.

By the end of this tutorial, you will have a working application that can switch between different AI models based on user input, demonstrating the power and flexibility of integrating multiple AI services.

Setup and Installation

First, we need to set up our development environment and install necessary packages. We’ll be using Next.js for our application framework, which is built on top of React and provides server-side rendering out of the box.

npx create-next-app@latest my-smart-app --ts
cd my-smart-app
npm install...

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