Vercel AI SDK — Build AI Apps in TypeScript

Core Features

Unified API

import { generateText } from 'ai';
import { openai } from '@ai-sdk/openai';

const { text } = await generateText({
  model: openai('gpt-4o'),
  prompt: 'Explain quantum computing',
});

Streaming

const result = streamText({
  model: anthropic('claude-sonnet-4-20250514'),
  prompt: 'Write a poem',
});
for await (const chunk of result.textStream) {
  process.stdout.write(chunk);
}

Tool Calling & Structured Output

const { object } = await generateObject({
  model: openai('gpt-4o'),
  schema: z.object({ name: z.string(), age: z.number() }),
  prompt: 'Generate a user profile',
});

React Hooks

const { messages, input, handleSubmit } = useChat();