Dev.to
6/25/2026

Build a RAG System with Claude & ChatGPT APIs
Short summary
This tutorial teaches how to build a RAG system combining Claude and ChatGPT APIs to retrieve documents and generate contextually rich responses. It walks through Node.js setup, document repository configuration, API integration, query handling logic, and testing. The approach is practical for customer support automation and research assistant applications that need high accuracy and relevance.
- •Combines Claude and ChatGPT APIs in a single RAG system for comparative response generation
- •Step-by-step implementation: document repository, API integration, query handling, and testing
- •Practical for customer support automation and research assistant applications
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