To use Anthropic’s Claude models, you will need to get an API Key from Anthropic. You can do this from their console. Once you obtain a key, set it in the environment variable, like so - 
ANTHROPIC_API_KEY="<Your key>"

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Install Anthtopic addon

npm install @llm-tools/embedjs-anthropic

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Usage

import { RAGApplicationBuilder } from '@llm-tools/embedjs';
import { Anthropic } from '@llm-tools/embedjs-anthropic';

const app = await new RAGApplicationBuilder()
.setModel(new Anthropic({ modelName: "..." }))