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LangChain.js supports AlephAlpha’s Luminous family of models. You’ll need to sign up for an API key on their website. Here’s an example:
See this section for general instructions on installing integration packages.
npm
npm install @langchain/community @langchain/core

import { AlephAlpha } from "@langchain/community/llms/aleph_alpha";

const model = new AlephAlpha({
  aleph_alpha_api_key: "YOUR_ALEPH_ALPHA_API_KEY", // Or set as process.env.ALEPH_ALPHA_API_KEY
});

const res = await model.invoke(`Is cereal soup?`);

console.log({ res });

/*
  {
    res: "\nIs soup a cereal? I don’t think so, but it is delicious."
  }
 */