Building a Conversational AI with Claude and ChatGPT APIs: A Practical Guide
Tutorial Intermediate ⏱ 35 min read © Gate of AI 2026-06-02 Architect a multi-provider LLM gateway in Next.js using App Router Route Handlers to dynamically toggle production requests between OpenAI and Anthropic architectures while maintaining state context. Prerequisites Node.js 18.x or higher Next.js 14.x or 15.x (App Router structure) Valid API keys configured in the