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# Quickstart Guide
# Basics
This tutorial gives you a quick walkthrough about building an end-to-end language model application with LangChain.
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For more details on how to use LLMs within LangChain, see the
[LLM Getting Started guide](../modules/models/llms/getting_started.ipynb).
> **NOTE:** There is a subtle but crucial difference between text completion models such as GPT-3 and chat models such as GPT-4. The former corresponds to the `LLM` class (what we are demonstrating here) and the latter to the `ChatModel` class. We discuss `ChatModel`s [below](#chat-models) and in [Part 2 of the Quickstart Guide](./getting_started_chat.md).
**NOTE:** There is a subtle but crucial difference between text completion models such as GPT-3 and chat models such as GPT-4. The former corresponds to the `LLM` class (what we are demonstrating here) and the latter to the `ChatModel` class. We discuss `ChatModel`s [below](#chat-models) and in [Part 2 of the Quickstart Guide](./getting_started_chat.md).
## Prompt Templates

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# Quickstart Guide: Part 2
## Chat Models
# Chat Models
This guide walks you through how the core LangChain modules work with chat models. We recommend first reading through the [Quickstart Guide](./getting_started.md), which introduces the core concepts in the context of LLMs.
Chat models are a variation on language models. While chat models use language models under the hood, the interface they expose is a bit different: rather than expose a "text in, text out" API, they expose an interface where "chat messages" are the inputs and outputs.
Chat model APIs are fairly new, so we are still figuring out the correct abstractions.
> **NOTE**: Before going further please make sure you've followed the [Installation](./getting_started.md#installation) and [Environment Setup](./getting_started.md#environment-setup) steps from the Quickstart Guide.
This guide walks you through how the core LangChain modules work with chat models. We recommend first reading through the [Quickstart Guide](./getting_started.md), which introduces the core concepts in the context of LLMs.\
\
Chat models are a variation on language models. While chat models use language models under the hood, the interface they expose is a bit different: rather than expose a "text in, text out" API, they expose an interface where "chat messages" are the inputs and outputs.\
\
Chat model APIs are fairly new, so we are still figuring out the correct abstractions.\
\
**NOTE**: Before going further please make sure you've followed the [Installation](./getting_started.md#installation) and [Environment Setup](./getting_started.md#environment-setup) steps from the Quickstart Guide.
## Message Completions

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:name: getting_started
:hidden:
getting_started/getting_started.md
getting_started/quickstart.rst
getting_started/concepts.md
getting_started/tutorials.md