Frontier · framework

Use Claude Sonnet 4 with Vercel AI SDK

Updated 2026-05-21 · By XALEN

How to use Claude Sonnet 4 (Frontier, ~500B) with Vercel AI SDK. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Claude Sonnet 4

~500B · 200K context · $0.03 input

Framework

Vercel AI SDK

framework · npm install ai @ai-sdk/openai

1. Install

npm install ai @ai-sdk/openai

2. Code

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

const xalen = createOpenAI({
  apiKey: 'xln_test_YOUR_KEY',
  baseURL: 'https://api.xalen.io/v1'
});

const { text } = await generateText({
  model: xalen('claude-sonnet-4'),
  prompt: 'What is Claude Sonnet 4?'
});
console.log(text);

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Last updated: 2026-05-21