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

# Pipeline

> Language models for schema and extraction

**Pipeline** language models run after convert. They do not read page pixels. They work on the cleaned text that layout, OCR, and format converters already produced.

They power shape and extract on the [Middleware API](/products/middleware). Split stays structure-aware (sections and headings) and is not this model family.

## Configuration

| Setting         | How it is configured                                                                                    |
| --------------- | ------------------------------------------------------------------------------------------------------- |
| Shape           | Infer classes, properties, and relationships from the converted text.                                   |
| Customer schema | A caller can supply a schema and skip discovery. Extract then follows that schema.                      |
| Extract         | Pull entities and relationships as structured records guided by the schema.                             |
| Scope           | One managed ingestion runs convert, split, shape, and extract. Each step is also a standalone tool.     |
| Output length   | Generation is sized for long extraction, not a short chat reply.                                        |
| Serving         | AiQL selects the checkpoint. Customers configure the job (source, optional schema), not the model name. |