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# Quickstart Guide
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# Basics
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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
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[LLM Getting Started guide](../modules/models/llms/getting_started.ipynb).
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> **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).
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**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).
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## Prompt Templates
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# Quickstart Guide: Part 2
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## Chat Models
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# Chat Models
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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.
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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.
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Chat model APIs are fairly new, so we are still figuring out the correct abstractions.
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> **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.
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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.\
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\
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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.\
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\
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Chat model APIs are fairly new, so we are still figuring out the correct abstractions.\
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\
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**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.
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## Message Completions
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:name: getting_started
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:hidden:
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getting_started/getting_started.md
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getting_started/quickstart.rst
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getting_started/concepts.md
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getting_started/tutorials.md
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