Frontier · language

Use Claude Sonnet 4 with JavaScript

Updated 2026-05-21 · By XALEN

How to use Claude Sonnet 4 (Frontier, ~500B) with JavaScript. 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

JavaScript

language · npm install xalen-sdk

1. Install

npm install xalen-sdk

2. Code

import XALEN from 'xalen-sdk';

const client = new XALEN({ apiKey: 'xln_test_YOUR_KEY' });

const response = await client.chat.completions.create({
  model: 'claude-sonnet-4',
  messages: [{ role: 'user', content: 'Hello from JavaScript!' }]
});
console.log(response.choices[0].message.content);

Claude Sonnet 4 with Other Frameworks

Python React Next.js Flask FastAPI Django Express.js Flutter

Other Models with JavaScript

Vedika Standard Vedika Fast Vedika Pro Ultra Vedika Vision Vedika Code Vedika Translate

200+ models. One API. Works with any framework.

Get API Key

Last updated: 2026-05-21