langchain/libs/partners/anthropic/README.md

langchain-anthropic

This package contains the LangChain integration for Anthropic's generative models.

Installation

pip install -U langchain-anthropic

Chat Models

API Model Name	Model Family
claude-instant-1.2	Claude Instant
claude-2.1	Claude
claude-2.0	Claude

To use, you should have an Anthropic API key configured. Initialize the model as:

from langchain_anthropic import ChatAnthropicMessages
from langchain_core.messages import AIMessage, HumanMessage

model = ChatAnthropicMessages(model="claude-2.1", temperature=0, max_tokens=1024)

Define the input message

message = HumanMessage(content="What is the capital of France?")

Generate a response using the model

response = model.invoke([message])

For a more detailed walkthrough see here.