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LangChain supports chat models hosted by Deep Infra through the ChatDeepInfra wrapper. First, you'll need to install the @langchain/community package:

npm install @langchain/community

You'll need to obtain an API key and set it as an environment variable named DEEPINFRA_API_TOKEN (or pass it into the constructor), then call the model as shown below:

import { ChatDeepInfra } from "@langchain/community/chat_models/deepinfra";
import { HumanMessage } from "@langchain/core/messages";

const apiKey = process.env.DEEPINFRA_API_TOKEN;

const model = "meta-llama/Meta-Llama-3-70B-Instruct";

const chat = new ChatDeepInfra({

const messages = [new HumanMessage("Hello")];

const res = await chat.invoke(messages);


API Reference:

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