2026 AI Agent SDKs Compared: Claude, Vercel, Gemini, LangGraph & Pi

The Ultimate Guide to 2026 AI Agent SDKs: Claude, Vercel, Gemini, LangGraph, and Pi 2026 marks the definitive shift from “Chatbots” to “Autonomous Agents.” The core question for developers today is no longer “which model is smartest,” but “which SDK provides the most robust environment for my Agent to actually get work done?” The AI development paradigm has evolved from simple prompt engineering to Environment and Tool Engineering. Today, success is defined by how seamlessly an Agent can observe its surroundings, manipulate tools, and manage long-term state. The 2026 AI SDK Landscape at a Glance In 2026, five major SDKs …