# LangChain with zurelay

> Agents and LangGraph, in Python or JavaScript.

Source: https://zurelay.com/docs/integrations/langchain

The examples use `claude-opus-5-5`. Any model ID from [the models page](https://zurelay.com/docs/models) works.

## Set it up

1. Install the OpenAI integration: `pip install langchain-openai` or `npm install @langchain/openai`.
2. Create `ChatOpenAI` with zurelay’s base URL, your key and a catalog model.
3. Use it anywhere LangChain or LangGraph takes a chat model.

## Configuration

**Python** (`agent.py`):

```python
import os
from langchain_openai import ChatOpenAI

llm = ChatOpenAI(
    model="claude-opus-5-5",
    base_url="https://api.zurelay.com/v1",
    api_key=os.environ["ZURELAY_API_KEY"],
)

print(llm.invoke("Hello").content)
```

**TypeScript** (`agent.ts`):

```typescript
import { ChatOpenAI } from "@langchain/openai";

const llm = new ChatOpenAI({
  model: "claude-opus-5-5",
  apiKey: process.env.ZURELAY_API_KEY,
  configuration: { baseURL: "https://api.zurelay.com/v1" },
});

const reply = await llm.invoke("Hello");
console.log(reply.content);
```

[LangChain’s own docs](https://docs.langchain.com/oss/python/integrations/chat/openai)