OTHER February 15, 2026

Vercel AI SDK 4.0 — Unified API Across All Major LLMs

WHAT CHANGED

Vercel released AI SDK 4.0 with a unified API that works identically across Claude, GPT-4o, Gemini, Mistral, and Llama. Includes streaming, tool use, and structured output.

WHY IT MATTERS

Write your AI integration once and swap models without changing code. The useChat and useCompletion hooks work across Next.js, SvelteKit, and plain React.

HOW TO USE IT

Install @ai-sdk/anthropic or other provider packages alongside the core ai package. The generateText and streamText functions work identically across all providers.

OTHER / TYPESCRIPT

import { generateText } from "ai";
import { anthropic } from "@ai-sdk/anthropic";

const { text } = await generateText({
  model: anthropic("claude-sonnet-4-6"),
  prompt: "Explain RAG in one paragraph"
});

console.log(text);

// Swap provider in one line — same API
// import { openai } from "@ai-sdk/openai";
// model: openai("gpt-4o")

sdkvercelmulti-modeltypescript

ORIGINAL SOURCE

https://vercel.com/blog/ai-sdk-4-0

VIEW ORIGINAL SOURCE →

AI SDK 4.0 is the most practical abstraction for indie builders who want model flexibility. Switching from Claude to GPT-4o or Gemini is a one-line change. The structured output and tool use APIs are also unified, making it easy to build provider-agnostic AI features.

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