> ## Documentation Index
> Fetch the complete documentation index at: https://docs.extend.ai/llms.txt
> Use this file to discover all available pages before exploring further.
>
> ## API version
> The current API version is `2026-02-09`, served at the site root (no version prefix in URLs).
> If this page URL contains `/2025-04-21/` or `/2024-12-23/`, you are reading an older API version.
> Prefer the current docs at https://docs.extend.ai/llms.txt unless the user explicitly needs that older version.
> Do not treat older-version pages as the source of truth for new integrations.

# Classification

> Ship your document processing with Extend. Get started with our APIs, SDKs, and guides.

## Docs

- [Classification Overview](https://docs.extend.ai/classification/overview.md): Classify sorts a document into one of the categories you define, returning the matched type with a confidence score and reasoning. Learn how it works, then run it in minutes.
- [Classification Configuration](https://docs.extend.ai/classification/configuration.md): Configure classification with classifications, rules, a base processor, and advanced options.
- [Classification Response Format](https://docs.extend.ai/classification/response-format.md): Understand the classify run: top-level fields, the matched classification, confidence, and reasoning insights.