Frontier · frontend

Use Claude Opus 4 with Next.js

Updated 2026-05-21 · By XALEN

How to use Claude Opus 4 (Frontier, ~2T) with Next.js. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Claude Opus 4

~2T · 200K context · $0.15 input

Framework

Next.js

frontend · npm install xalen-sdk

1. Install

npm install xalen-sdk

2. Code

// app/api/chat/route.ts
import XALEN from 'xalen-sdk';

const client = new XALEN({ apiKey: process.env.XALEN_API_KEY });

export async function POST(req: Request) {
  const { messages } = await req.json();
  const response = await client.chat.completions.create({
    model: 'claude-opus-4',
    messages,
    stream: true
  });
  return new Response(response.toReadableStream());
}

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Last updated: 2026-05-21