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

# ChatYandexGPT integration

> Integrate with the ChatYandexGPT chat model using LangChain JavaScript.

LangChain.js supports calling [YandexGPT](https://cloud.yandex.com/en/services/yandexgpt) chat models.

## Setup

First, you should [create a service account](https://cloud.yandex.com/en/docs/iam/operations/sa/create) with the `ai.languageModels.user` role.

Next, you have two authentication options:

* [IAM token](https://cloud.yandex.com/en/docs/iam/operations/iam-token/create-for-sa).
  You can specify the token in a constructor parameter as `iam_token` or in an environment variable `YC_IAM_TOKEN`.
* [API key](https://cloud.yandex.com/en/docs/iam/operations/api-key/create)
  You can specify the key in a constructor parameter as `api_key` or in an environment variable `YC_API_KEY`.

## Usage

<Tip>
  See [this section for general instructions on installing LangChain packages](/oss/javascript/langchain/install).
</Tip>

```bash npm theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
npm install @langchain/yandex @langchain/core
```

```typescript theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
import { ChatYandexGPT } from "@langchain/yandex/chat_models";
import { HumanMessage, SystemMessage } from "@langchain/core/messages";

const chat = new ChatYandexGPT();

const res = await chat.invoke([
  new SystemMessage(
    "You are a helpful assistant that translates English to French."
  ),
  new HumanMessage("I love programming."),
]);
console.log(res);

/*
AIMessage {
  lc_serializable: true,
  lc_kwargs: { content: "Je t'aime programmer.", additional_kwargs: {} },
  lc_namespace: [ 'langchain', 'schema' ],
  content: "Je t'aime programmer.",
  name: undefined,
  additional_kwargs: {}
}
 */
```

## Related

* Chat model [conceptual guide](/oss/javascript/langchain/models)
* Chat model [how-to guides](/oss/javascript/langchain/models)

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