Open Source · framework

Use Yi Lightning with LangChain

Updated 2026-05-21 · By XALEN

How to use Yi Lightning (Open Source, 200B MoE) with LangChain. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Yi Lightning

200B MoE · 128K context · $0.04 input

Framework

LangChain

framework · pip install langchain-openai

1. Install

pip install langchain-openai

2. Code

from langchain_openai import ChatOpenAI

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

response = llm.invoke("What is Yi Lightning?")
print(response.content)

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Last updated: 2026-05-21