Running ChatGPT, Claude, and Gemini in One TypeScript App

Running ChatGPT, Claude, and Gemini in One TypeScript App What if you could use GPT-4o for creative writing, Claude for code review, and Gemini for document analysis — all in the same TypeScript app, with the same API? Most developers pick one AI provider and build their entire app around it. Then six months later, when prices change or a better model drops, they're stuck rewriting everything. I've been there. Here's how to build a multi-provider AI app from day one using a single TypeScript SDK — and why it matters more than you think. The Problem: Three SDKs, Three Headaches Let's say you want to use OpenAI, Anthropic, and Google AI in the same project. Here's what you're signing up for: // OpenAI import OpenAI from "openai"; const openai = new OpenAI({ apiKey: process.env.OPENAI_KEY }); const chat = await openai.chat.completions.create({ model: "gpt-4o", messages: [{ role: "user", content: "Hello" }], }); // Anthropic import Anthropic from "@anthropic-ai/sdk"; const anthropic = new