Anthropic Provider

Learn how to use Anthropic’s Claude models for text generation and tool calling with the AI SDK.

Anthropic Provider

The Anthropic provider enables you to use Claude models for advanced text generation, reasoning, and tool calling capabilities.

Installation

npm

npm install @ai-sdk/anthropic

pnpm add @ai-sdk/anthropic

yarn add @ai-sdk/anthropic

bun add @ai-sdk/anthropic

Setup

Get your API key from Anthropic’s Console and set it as an environment variable:

ANTHROPIC_API_KEY=your-api-key

Usage

Basic Text Generation

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

const { text } = await generateText({
  model: anthropic('claude-3-5-sonnet-20241022'),
  prompt: 'Explain quantum computing in simple terms.',
});

Streaming Responses

import { anthropic } from '@ai-sdk/anthropic';
import { streamText } from 'ai';

const result = streamText({
  model: anthropic('claude-3-5-sonnet-20241022'),
  prompt: 'Write a short story about AI.',
});

for await (const chunk of result.textStream) {
  process.stdout.write(chunk);
}

Structured Output

import { anthropic } from '@ai-sdk/anthropic';
import { generateObject } from 'ai';
import { z } from 'zod';

const { object } = await generateObject({
  model: anthropic('claude-3-5-sonnet-20241022'),
  schema: z.object({
    ingredients: z.array(z.string()),
    instructions: z.array(z.string()),
  }),
  prompt: 'Generate a recipe for chocolate chip cookies.',
});

Configuration

Custom Provider Instance

import { createAnthropic } from '@ai-sdk/anthropic';

const anthropic = createAnthropic({
  apiKey: process.env.ANTHROPIC_API_KEY,
  baseURL: 'https://api.anthropic.com/v1',
});

Provider Options

• apiKey: Your Anthropic API key (defaults to ANTHROPIC_API_KEY env var)
• baseURL: Custom API endpoint URL
• headers: Custom headers for requests

Available Models

Claude 3.5 Family

• claude-3-5-sonnet-20241022 - Most capable Claude 3.5 model
• claude-3-5-haiku-20241022 - Fastest Claude 3.5 model

Claude 3 Family

• claude-3-opus-20240229 - Most powerful model
• claude-3-sonnet-20240229 - Balanced performance
• claude-3-haiku-20240307 - Fast and cost-effective

Advanced Features

Tool Calling

import { anthropic } from '@ai-sdk/anthropic';
import { generateText } from 'ai';
import { z } from 'zod';

const result = await generateText({
  model: anthropic('claude-3-5-sonnet-20241022'),
  tools: {
    calculator: {
      description: 'Perform calculations',
      parameters: z.object({
        expression: z.string(),
      }),
      execute: async ({ expression }) => {
        return { result: eval(expression) };
      },
    },
  },
  prompt: 'What is 15 multiplied by 24?',
});

Vision

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

const result = await generateText({
  model: anthropic('claude-3-5-sonnet-20241022'),
  messages: [
    {
      role: 'user',
      content: [
        { type: 'text', text: 'Describe this image in detail.' },
        { type: 'image', image: fs.readFileSync('./photo.jpg') },
      ],
    },
  ],
});

PDF Support

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

const result = await generateText({
  model: anthropic('claude-3-5-sonnet-20241022'),
  messages: [
    {
      role: 'user',
      content: [
        { type: 'text', text: 'Summarize this document.' },
        {
          type: 'file',
          data: fs.readFileSync('./document.pdf'),
          mediaType: 'application/pdf',
        },
      ],
    },
  ],
});

Prompt Caching

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

const result = await generateText({
  model: anthropic('claude-3-5-sonnet-20241022'),
  messages: [
    {
      role: 'user',
      content: 'Long context that should be cached...',
      providerOptions: {
        anthropic: {
          cacheControl: { type: 'ephemeral' },
        },
      },
    },
  ],
});

Reasoning Models

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

const { text, reasoningText } = await generateText({
  model: anthropic('claude-opus-4-20250514'),
  prompt: 'How many people will live in the world in 2040?',
  providerOptions: {
    anthropic: {
      thinking: { type: 'enabled', budgetTokens: 12000 },
    },
  },
});

console.log('Reasoning:', reasoningText);
console.log('Answer:', text);

Model Capabilities

Model	Vision	Tools	Structured Output
claude-3-5-sonnet-20241022	✓	✓	✓
claude-3-5-haiku-20241022	✓	✓	✓
claude-3-opus-20240229	✓	✓	✓
claude-3-sonnet-20240229	✓	✓	✓
claude-3-haiku-20240307	✓	✓	✓

Resources

• Anthropic Documentation
• AI SDK Documentation
• Claude API Reference