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# Anthropic
>[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`.
## Installation and Setup
To use `Anthropic` models, you need to install a python package:
```bash
pip install -U langchain-anthropic
```
You need to set the `ANTHROPIC_API_KEY` environment variable.
You can get an Anthropic API key [here](https://console.anthropic.com/settings/keys)
## Chat Models
### ChatAnthropic
See a [usage example](/docs/integrations/chat/anthropic).
```python
from langchain_anthropic import ChatAnthropic
model = ChatAnthropic(model='claude-3-opus-20240229')
```
## LLMs
### [Legacy] AnthropicLLM
**NOTE**: `AnthropicLLM` only supports legacy `Claude 2` models.
To use the newest `Claude 3` models, please use `ChatAnthropic` instead.
See a [usage example](/docs/integrations/llms/anthropic).
```python
from langchain_anthropic import AnthropicLLM
model = AnthropicLLM(model='claude-2.1')
```
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