> ## Documentation Index
> Fetch the complete documentation index at: https://langchain.idochub.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# ChatAbso

This will help you get started with ChatAbso [chat models](https://python.langchain.com/docs/concepts/chat_models/). For detailed documentation of all ChatAbso features and configurations, head to the [API reference](https://python.langchain.com/api_reference/en/latest/chat_models/langchain_abso.chat_models.ChatAbso.html).

* You can find the full documentation for the Abso router \[here] ([abso.ai](https://abso.ai))

## Overview

### Integration details

| Class                                                                                                                 | Package                                                                                        | Local | Serializable | [JS support](https://js.langchain.com/docs/integrations/chat/abso) |                                            Downloads                                            |                                            Version                                           |
| :-------------------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------- | :---: | :----------: | :----------------------------------------------------------------: | :---------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------------------------: |
| [ChatAbso](https://python.langchain.com/api_reference/en/latest/chat_models/langchain_abso.chat_models.ChatAbso.html) | [langchain-abso](https://python.langchain.com/api_reference/en/latest/abso_api_reference.html) |   ❌   |       ❌      |                                  ❌                                 | ![PyPI - Downloads](https://img.shields.io/pypi/dm/langchain-abso?style=flat-square\&label=%20) | ![PyPI - Version](https://img.shields.io/pypi/v/langchain-abso?style=flat-square\&label=%20) |

## Setup

To access ChatAbso models, you'll need to create an OpenAI account, get an API key, and install the `langchain-abso` integration package.

### Credentials

* TODO: Update with relevant info.

Head to (TODO: link) to sign up for ChatAbso and generate an API key. Once you've done this, set the ABSO\_API\_KEY environment variable:

```python theme={null}
import getpass
import os

if not os.getenv("OPENAI_API_KEY"):
    os.environ["OPENAI_API_KEY"] = getpass.getpass("Enter your OpenAI API key: ")
```

### Installation

The LangChain ChatAbso integration lives in the `langchain-abso` package:

```python theme={null}
%pip install -qU langchain-abso
```

## Instantiation

Now we can instantiate our model object and generate chat completions:

```python theme={null}
from langchain_abso import ChatAbso

llm = ChatAbso(fast_model="gpt-4o", slow_model="o3-mini")
```

## Invocation

```python theme={null}
messages = [
    (
        "system",
        "You are a helpful assistant that translates English to French. Translate the user sentence.",
    ),
    ("human", "I love programming."),
]
ai_msg = llm.invoke(messages)
ai_msg
```

```python theme={null}
print(ai_msg.content)
```

## Chaining

We can [chain](/oss/python/how-to/sequence/) our model with a prompt template like so:

```python theme={null}
from langchain_core.prompts import ChatPromptTemplate

prompt = ChatPromptTemplate(
    [
        (
            "system",
            "You are a helpful assistant that translates {input_language} to {output_language}.",
        ),
        ("human", "{input}"),
    ]
)

chain = prompt | llm
chain.invoke(
    {
        "input_language": "English",
        "output_language": "German",
        "input": "I love programming.",
    }
)
```

## API reference

For detailed documentation of all ChatAbso features and configurations head to the API reference: [python.langchain.com/api\_reference/en/latest/chat\_models/langchain\_abso.chat\_models.ChatAbso.html](https://python.langchain.com/api_reference/en/latest/chat_models/langchain_abso.chat_models.ChatAbso.html)