Open Source · framework

Use Baichuan 4 with LangChain

Updated 2026-05-21 · By XALEN

How to use Baichuan 4 (Open Source, ~130B) with LangChain. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Baichuan 4

~130B · 128K context · $0.05 input

Framework

LangChain

framework · pip install langchain-openai

1. Install

pip install langchain-openai

2. Code

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(
    model="baichuan-4",
    openai_api_key="xln_test_YOUR_KEY",
    openai_api_base="https://api.xalen.io/v1"
)

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

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Last updated: 2026-05-21