Building applications with LLMs through composability
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README
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<a href="https://docs.langchain.com/oss/python/langchain/overview">
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<h3>The agent engineering platform.</h3>
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<br>
LangChain is a framework for building agents and LLM-powered applications. It helps you chain together interoperable components and third-party integrations to simplify AI application development — all while future-proofing decisions as the underlying technology evolves.
> [!TIP]
> Just getting started? Check out **[Deep Agents](http://docs.langchain.com/oss/python/deepagents/)** — a higher-level package built on LangChain for agents that have built-in capabilites for common usage patterns such as planning, subagents, file system usage, and more.
## Quickstart
```bash
uv add langchain
```
```python
from langchain.chat_models import init_chat_model
model = init_chat_model("openai:gpt-5.5")
result = model.invoke("Hello, world!")
```
If you're looking for more advanced customization or agent orchestration, check out [LangGraph](https://g