Saturday, December 13, 2025

AI Agents: Vercel AI SDK vs OpenAI Agent SDK vs Claude Agent SDK

How to build AI Agents with Vercel and the AI SDK | Vercel Knowledge Base

vercel/ai: The AI Toolkit for TypeScript. From the creators of Next.js, the AI SDK is a free open-source library for building AI-powered applications and agents @GitHub
Apache v2 license, TypeScript only



Gyld - AI Employee Platform

OpenAI AgentSDKFastMediumOpenAI onlyQuick MVPs, managed solutions
Vercel AI SDKMediumHighMultipleWeb apps, streaming UX
Claude APIMediumHighAnthropic onlyComplex reasoning, safety-critical apps

The core difference is that 
the Vercel AI SDK provides a unified, multi-provider interface with built-in agent loop control for web frameworks, while the OpenAI Agents SDK offers a lightweight, specialized framework specifically for orchestrating multiple, powerful OpenAI agents with features like handoffs and guardrails. 
Vercel AI SDK Agentic Loop
The Vercel AI SDK is a comprehensive toolkit for building AI-powered applications. It supports TypeScript and is particularly suited for the Next.js ecosystem, but also works with React, Svelte, and Vue. The agentic loop features are part of a broader API that works with different providers. 
  • Multi-Provider Support: This feature removes the differences between various LLM providers, such as OpenAI, Anthropic, and Google Gemini. This allows developers to switch between models with minimal code changes.
  • Built-in Loop Control: Parameters like stopWhen and prepareStep fine-tune and control the flow of multi-step tool calls. This offers flexibility in managing the agent's execution flow.
  • Web-focused: It integrates seamlessly with modern web frameworks. It includes client-side hooks (useChatuseCompletion) for building streaming UIs.
  • Unified Developer Experience: It aims to provide a stable interface and end-to-end type safety. This allows developers to focus on outcomes rather than the mechanics of calling different models. 
OpenAI Agents SDK
The OpenAI Agents SDK is a focused library designed for building AI agents using the OpenAI ecosystem. 
  • OpenAI-specific: It is designed to work exclusively with OpenAI models. This makes it ideal if you are already using the OpenAI stack.
  • Agent Handoffs: This feature allows the transfer of control between multiple specialized agents. This is useful for solving complex problems more efficiently.
  • Guardrails and Tracing: It includes built-in guardrails for input/output validation and tracing tools to monitor and debug agent behavior.
  • Lightweight Primitives: It provides essential agent primitives. This facilitates rapid development of complex tool-using capabilities. Memory/history persistence is an implementation detail for the developer to manage. 
Summary of Differences
Feature Vercel AI SDKOpenAI Agents SDK
Provider SupportMulti-provider (OpenAI, Anthropic, Google, etc.)OpenAI only
Primary GoalUnified interface for building full AI apps with agent featuresSpecialized framework for orchestrating powerful OpenAI agents
Agent OrchestrationBuilt-in loop control (stopWhenprepareStep)Agent handoffs for multi-agent coordination
IntegrationTightly integrated with web frameworks (Next.js, React, etc.)Web-friendly, but requires manual integration for UI hooks
Memory ManagementHandled by developer, can be integrated with external servicesIntentionally left to the developer to implement
Guardrails/TracingGeneral tool-calling and structured output with ZodBuilt-in guardrails and tracing tools
The Vercel AI SDK provides a flexible foundation for building AI experiences across different providers. The OpenAI Agents SDK offers tools for building agent systems within the OpenAI ecosystem. 


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