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*   Anthropic

On this page

Anthropic
=========

All functionality related to Anthropic models.

[Anthropic](https://www.anthropic.com/) is an AI safety and research company, and is the creator of Claude. This page covers all integrations between Anthropic models and LangChain.

Prompting Best Practices[​](#prompting-best-practices "Direct link to Prompting Best Practices")
------------------------------------------------------------------------------------------------

Anthropic models have several prompting best practices compared to OpenAI models.

**System Messages may only be the first message**

Anthropic models require any system messages to be the first one in your prompts.

`ChatAnthropic`[​](#chatanthropic "Direct link to chatanthropic")
-----------------------------------------------------------------

`ChatAnthropic` is a subclass of LangChain's `ChatModel`, meaning it works best with `ChatPromptTemplate`. You can import this wrapper with the following code:

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/anthropic

    yarn add @langchain/anthropic

    pnpm add @langchain/anthropic

    import { ChatAnthropic } from "@langchain/anthropic";const model = new ChatAnthropic({});

When working with ChatModels, it is preferred that you design your prompts as `ChatPromptTemplate`s. Here is an example below of doing that:

    import { ChatPromptTemplate } from "langchain/prompts";const prompt = ChatPromptTemplate.fromMessages([  ["system", "You are a helpful chatbot"],  ["human", "Tell me a joke about {topic}"],]);

You can then use this in a chain as follows:

    const chain = prompt.pipe(model);await chain.invoke({ topic: "bears" });

See the [chat model integration page](/v0.2/docs/integrations/chat/anthropic/) for more examples, including multimodal inputs.

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*   [Prompting Best Practices](#prompting-best-practices)
*   [`ChatAnthropic`](#chatanthropic)

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