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# AI21 Labs
>[AI21 Labs](https://www.ai21.com/about) is a company specializing in Natural
> Language Processing (NLP), which develops AI systems
> that can understand and generate natural language.
This page covers how to use the `AI21` ecosystem within `LangChain`.
## Installation and Setup
- Get an AI21 api key and set it as an environment variable (`AI21_API_KEY`)
- Install the Python package:
```bash
pip install langchain-ai21
```
## Chat models
### AI21 Chat
See a [usage example](/docs/integrations/chat/ai21).
```python
from langchain_ai21 import ChatAI21
```
## Deprecated features
:::caution The following features are deprecated.
:::
### AI21 LLM
```python
from langchain_ai21 import AI21LLM
```
### AI21 Contextual Answer
```python
from langchain_ai21 import AI21ContextualAnswers
```
### AI21 Embeddings
```python
from langchain_ai21 import AI21Embeddings
```
## Text splitters
### AI21 Semantic Text Splitter
```python
from langchain_ai21 import AI21SemanticTextSplitter
``` |