Open Source · framework

Use Llama 4 Maverick with LangChain

Updated 2026-05-21 · By XALEN

How to use Llama 4 Maverick (Open Source, 400B (17B active)) with LangChain. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Llama 4 Maverick

400B (17B active) · 256K context · $0.07 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-4-maverick",
    openai_api_key="xln_test_YOUR_KEY",
    openai_api_base="https://api.xalen.io/v1"
)

response = llm.invoke("What is Llama 4 Maverick?")
print(response.content)

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Last updated: 2026-05-21