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*   [Chat models](/v0.2/docs/integrations/chat/)
*   YandexGPT

On this page

ChatYandexGPT
=============

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

Setup[​](#setup "Direct link to 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[​](#usage "Direct link to Usage")
---------------------------------------

tip

See [this section for general instructions on installing integration packages](/v0.2/docs/how_to/installation#installing-integration-packages).

*   npm
*   Yarn
*   pnpm

    npm install @langchain/yandex

    yarn add @langchain/yandex

    pnpm add @langchain/yandex

    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: {}} */

#### API Reference:

*   [ChatYandexGPT](https://v02.api.js.langchain.com/classes/langchain_yandex_chat_models.ChatYandexGPT.html) from `@langchain/yandex/chat_models`
*   [HumanMessage](https://v02.api.js.langchain.com/classes/langchain_core_messages.HumanMessage.html) from `@langchain/core/messages`
*   [SystemMessage](https://v02.api.js.langchain.com/classes/langchain_core_messages.SystemMessage.html) from `@langchain/core/messages`

* * *

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*   [Setup](#setup)
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