> For the complete documentation index, see [llms.txt](https://lastmile-ai.gitbook.io/lastmile-ai-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lastmile-ai.gitbook.io/lastmile-ai-docs/workbooks/intro-to-workbooks.md).
# Intro to Workbooks
## What is a workbook in LastMile AI?
A workbook enables you to string together various generative AI models to build powerful applications. In a workbook, you can connect text, image, and audio models in a single environment.
## Composing with cells
Workbooks are made up of a series of cells. Each cell has its own cell type:
* **Model cells** are used to prompt generative AI models and output responses which can then be copied as inputs into sequential cells. There are two types of model cells:
* *Standard model cells* are used to prompt supported generative AI models like GPT-3.5 Turbo (ChatGPT), PaLM2, Stable Diffusion v1.4, Bark, Whisper, and DALL-E2. Each model cell takes in a prompt that is unique to the input modality (text, audio) required by the model. For example, a ChatGPT cell takes in text input and returns text output and a Whisper cell takes in an audio input and return a text output.
* *Custom model cells* are used to prompt models that you have customized with your own data.
* **Text cells** allow you to compose formatted text.
Cells can easily be added to your workbook via the add block (+) menu.
## Executing cells to generate results
You need to execute the cell in order to see the output. You do this in the following ways:
* Click the **Play** button on the cell.
* Press **Enter** on your keyboard while focused on a cell.
## Adjusting settings for model cells
You can access a set of model settings in the cell's setting menu. The settings available are specific to the model, so it's always worth exploring this menu.