> ## 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.

![Extend Logo](/_fern-files/_img/72ab2f25d13697a61ce5c930f237e32c7767ad01d2a1ff97b006fe789daa5d2b.webp)![Extend Logo](/_fern-files/_img/ca19bcf62db287080becdaf9903250c70e0562dd6a5585d4a19616ca30ff3914.webp)

Turn your documents into high quality data, achieve unmatched accuracy, and ship custom document automation in days, not months.

#### [Guides](/2024-12-23/product/getting-started)

Learn how to use Extend's document processing features.

#### [API Reference](/2024-12-23/developers)

Detailed API documentation and SDKs for developers.

#### [Processors](/2024-12-23/developers/processor-endpoints/run-processor)

Create and run document extractors, splitters, and classifiers.

#### [Workflows](/2024-12-23/developers/workflow-endpoints/run-workflow)

Run end-to-end document pipelines with Extend.

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

## Docs

- [Evaluation Overview](https://docs.extend.ai/2024-12-23/product/evaluation/overview.md): Evaluation sets measure the accuracy of an extractor, classifier, or splitter against reviewed ground truth. Create sets and run them via the SDK (evaluationSets, evaluationSetItems, evaluationSetRuns) or in Extend Studio.
- [Calculating Array Accuracy](https://docs.extend.ai/2024-12-23/product/evaluation/calculating-array-accuracy.md): How Extend calculates accuracy for array data
- [External Data Validation Step](https://docs.extend.ai/2024-12-23/product/workflows/external-data-validation-step.md): How to leverage the External Data Validation step in a workflow.
- [Conditional Extraction Step](https://docs.extend.ai/2024-12-23/product/workflows/conditional-extraction-step.md): How to use the Conditional Extraction step to dynamically route documents to different extractors.
- [Validation Formulas](https://docs.extend.ai/2024-12-23/product/validation-rules/formulas.md): How to write formulas that reference variables and perform calculations
- [Rate Limits](https://docs.extend.ai/2024-12-23/developers/guides/rate-limits.md): Extend API rate limits by plan tier — per-endpoint request limits, processor throughput, workspace-level overrides, and how to handle 429 responses.
- [User Roles and Permissions](https://docs.extend.ai/2024-12-23/developers/guides/user-roles-and-permissions.md): Learn about the different user roles in Extend and what each role can access
- [Changelog](https://docs.extend.ai/2024-12-23/release-notes.md): Updates and improvements to the Extend platform.
- [Changelog (all entries)](https://docs.extend.ai/2024-12-23/release-notes/llms.txt)
- [Model Versioning Overview](https://docs.extend.ai/2024-12-23/model-versioning/overview.md): What base model versions are and how they are versioned. Base versions are Extend's underlying model releases, pinned per processor with baseVersion; they are separate from the published versions of your own processor configuration.
- [Parse Performance](https://docs.extend.ai/2024-12-23/model-versioning/parse/parse-performance.md): Changelog for the Parse Performance base processor in Extend.
- [Parse Light](https://docs.extend.ai/2024-12-23/model-versioning/parse/parse-light.md): Changelog for the Parse Light base model version in Extend.
- [Extraction Light](https://docs.extend.ai/2024-12-23/model-versioning/extraction/extraction-light.md): Changelog for the Extraction Light base processor in Extend.
- [Classification Performance](https://docs.extend.ai/2024-12-23/model-versioning/classification/classification-performance.md): Changelog for the Classification Performance base processor in Extend.
- [Classification Light](https://docs.extend.ai/2024-12-23/model-versioning/classification/classification-light.md): Changelog for the Classification Light base processor in Extend.
- [Splitting Performance](https://docs.extend.ai/2024-12-23/model-versioning/splitting/splitting-performance.md): Changelog for the Splitting Performance base processor in Extend.
- [Splitting Light](https://docs.extend.ai/2024-12-23/model-versioning/splitting/splitting-light.md): Changelog for the Splitting Light base processor in Extend.