Open Source · framework

Use Llama 3.1 405B with Vercel AI SDK

Updated 2026-05-21 · By XALEN

How to use Llama 3.1 405B (Open Source, 405B) with Vercel AI SDK. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Llama 3.1 405B

405B · 128K context · $0.08 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('llama-3-1-405b'),
  prompt: 'What is Llama 3.1 405B?'
});
console.log(text);

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Last updated: 2026-05-21