Open Source · frontend

Use DeepSeek V3.1 with Next.js

Updated 2026-05-21 · By XALEN

How to use DeepSeek V3.1 (Open Source, 685B (37B active)) with Next.js. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

DeepSeek V3.1

685B (37B active) · 128K context · $0.06 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: 'deepseek-v3-1',
    messages,
    stream: true
  });
  return new Response(response.toReadableStream());
}

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Last updated: 2026-05-21