# Changelog

This changelog documents notable updates to the Pex AI Song Detector API, including new features, improvements, and model attribution enhancements.

#### v6 - May 22, 2026

Improved:

* Further reduced false positives in challenging edge cases.

#### v5 - April 16, 2026

Added:

* Introduced **new model attribution classifier**: **Google Lyria**.

Improved:

* Increased detection accuracy, especially for **ElevenLabs** and **Boomy** songs.

#### v4 - February 24, 2026

Improved:

* Improved model attribution accuracy.
* Increased overall detection accuracy, with the focus on reducing false positives in challenging edge cases.

#### v3 - January 28, 2026

Added:

* Introduced **two new model attribution classifiers**: **Mureka** and **Sonauto**.
* The model attribution classifier supports a defined set of platforms listed above.\
  Detection of AI-generated music is broader and not limited to these platforms. In such cases, `predicted_model` may be `null`.

#### v2 - January 7, 2026

Added:

* **Model attribution classifier** to identify which model most likely generated the queried song, when the detector has strong attribution confidence.
  * New response fields:
    * `predicted_model` (string)
    * `predicted_model_score` (float)
* Expanded attribution coverage with targeted improvements for **ElevenLabs** and **Boomy**, while maintaining broad attribution across other leading AI music generators.

Improved:

* **Higher detection accuracy**: internal evaluation shows an estimated **\~10% relative lift** versus v1 (varies by content type, genre, and audio quality).

#### v1 - December 1, 2025

Added:

* **Initial release** of the Pex AI Song Detector API.
* **Broad support** across major AI music generation platforms.
* **Per-request confidence scoring** via `ai_score`.


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