> ## 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 Performance

> Changelog for the Classification Performance base processor in Extend.

Our highest performance (in terms of accuracy and reliability) base classification processor. Always stays up to date with the best foundation models available across all of our benchmarks.

## Versions

| Version | Date       | Changelog                                                                                                                                                   |
| ------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `3.5.0` | 2026-04-15 | Model version upgrade.                                                                                                                                      |
| `3.4.0` | 2025-09-30 | Adds support for classification memory, enabling the processor to leverage prior classification examples for improved accuracy on recurring document types. |
| `3.3.0` | 2025-05-15 | Model upgrade with improvements to reasoning and overall performance.                                                                                       |
| `3.2.0` | 2024-08-27 | More steerable model reasoning.                                                                                                                             |
| `3.1.0` | 2024-08-16 | Updates to our document pre-processing to better handle more complex document/table layouts.                                                                |
| `3.0.0` | 2024-05-14 | Promoting a new foundation model to default - it's faster and more accurate across all of our internal benchmarks for classification.                       |
| `2.1.0` | 2024-05-01 | Adds support for classification rules and reminders.                                                                                                        |
| `2.0.0` | 2024-04-12 | Promoting a new foundation model to default. Very minor increases in accuracy and speed.                                                                    |
| `1.0.0` | 2023-08-01 | Initial (and now legacy) classification model and processor.                                                                                                |

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