Open Source · framework

Use Llama 3.1 405B with LangChain

Updated 2026-05-21 · By XALEN

How to use Llama 3.1 405B (Open Source, 405B) with LangChain. 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

LangChain

framework · pip install langchain-openai

1. Install

pip install langchain-openai

2. Code

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(
    model="llama-3-1-405b",
    openai_api_key="xln_test_YOUR_KEY",
    openai_api_base="https://api.xalen.io/v1"
)

response = llm.invoke("What is Llama 3.1 405B?")
print(response.content)

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Last updated: 2026-05-21