> ## Documentation Index
> Fetch the complete documentation index at: https://docs.neutrinoapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# LangChain

> Call the Neutrino Router using LangChain

## Usage

Simply set the `openai_api_base` and `openai_api_key` to point to Neutrino and the `model_name` to the Neutrino Router ID.

```python theme={null}
from langchain.chat_models import ChatOpenAI
from langchain.schema import HumanMessage

client = ChatOpenAI(
    openai_api_base="https://router.neutrinoapp.com/api/llm-router",
    openai_api_key="<Neutrino-API-key>",
    model_name="your-neutrino-router-id",  # (or 'default')
)

response = client.invoke([HumanMessage(content="What is the capital of France?")])

print(response.content)
```