> ## 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.

# Model Versioning

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

## Docs

- [Model Versioning Overview](https://docs.extend.ai/2026-02-09/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/2026-02-09/model-versioning/parse/parse-performance.md): Changelog for the Parse Performance base processor in Extend.
- [Parse Light](https://docs.extend.ai/2026-02-09/model-versioning/parse/parse-light.md): Changelog for the Parse Light base model version in Extend.
- [Parse Auto](https://docs.extend.ai/2026-02-09/model-versioning/parse/parse-auto.md): Changelog for the Parse Auto base model version in Extend.
- [Extraction Performance](https://docs.extend.ai/2026-02-09/model-versioning/extraction/extraction-performance.md): Changelog for the Extraction Performance base processor in Extend.
- [Extraction Light](https://docs.extend.ai/2026-02-09/model-versioning/extraction/extraction-light.md): Changelog for the Extraction Light base processor in Extend.
- [Extraction Operator](https://docs.extend.ai/2026-02-09/model-versioning/extraction/extraction-operator.md): Versions of the Operator base processor and their underlying extraction defaults.
- [Classification Standard](https://docs.extend.ai/2026-02-09/model-versioning/classification/classification-standard.md): Changelog for the Classification Standard base processor in Extend.
- [Classification Performance](https://docs.extend.ai/2026-02-09/model-versioning/classification/classification-performance.md): Changelog for the Classification Performance base processor in Extend.
- [Classification Light](https://docs.extend.ai/2026-02-09/model-versioning/classification/classification-light.md): Changelog for the Classification Light base processor in Extend.
- [Splitting Performance](https://docs.extend.ai/2026-02-09/model-versioning/splitting/splitting-performance.md): Changelog for the Splitting Performance base processor in Extend.
- [Splitting Light](https://docs.extend.ai/2026-02-09/model-versioning/splitting/splitting-light.md): Changelog for the Splitting Light base processor in Extend.
- [Edit](https://docs.extend.ai/2026-02-09/model-versioning/edit/edit.md): Changelog for the Edit engine in Extend.