> ## Documentation Index
> Fetch the complete documentation index at: https://docs.supertoneapi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Release Notes

> Check the latest updates and changes to Supertone API.

<Update label="2025-12-08" description="v1.3.0">
  ## New TTS Models Released: `sona_speech_2` & `supertonic_api_1`

  Supertone API now supports two new speech synthesis models, expanding multilingual capabilities and offering more flexible generation options.

  ### Key Updates

  1. **`sona_speech_2` (Multilingual Advanced Model)**
     * Supports **23 languages**
     * Improved speech quality and stability
     * Supports `pitch_shift`, `pitch_variance`, `speed`

  2. **`supertonic_api_1` (beta, Lightweight Low-Latency Model)**
     * Supports `en`, `ko`, `ja`, `es`, `pt`
     * Designed for fast inference
     * Supports only the `speed` Voice Setting

  3. **Model Selection Expanded**
     * TTS requests now support: `sona_speech_1`, `sona_speech_2`, `supertonic_api_1`
</Update>

<Update label="2025-07-31" description="v.1.2.0">
  ## Supertone API Update

  Several new features have been added to the Supertone API.\
  In this release, **Preset Voices** and **Custom Voices** have been separated, and voice cloning registration via API is now supported.\
  Additionally, a beta version of the streaming TTS has been released.

  ### Key Updates

  1. **Separation of Preset Voice and Custom Voice**
     * Preset Voice: Voices created and provided by Supertone
     * Custom Voice: Voices registered and managed by the customer
  2. **Voice Cloning registration feature added to the API**
     * Voice cloning, previously only available in Supertone Play, is now also supported via API
  3. **Streaming TTS (Beta) released**
     * A beta version of the streaming TTS API is now available, ideal for real-time applications such as AI chatbots and character-based chats
</Update>

<Update label="2025-05-28" description="v.1.1.0">
  ## Supertone API Grand Open

  Supertone API has officially launched after completing its closed beta phase.
  This release features a complete overhaul of the service structure and API usability, evolving into a more intuitive and scalable voice generation platform through integration with Play and unification of the voice system.

  <Frame>
    <img src="https://mintcdn.com/supertone-b89202c8/0gAKILFZFHulmmA8/images/supertone-api-grand-open.png?fit=max&auto=format&n=0gAKILFZFHulmmA8&q=85&s=1a8c108b3cc1569bd3b87aacc44fc0b1" alt="" width="2118" height="1380" data-path="images/supertone-api-grand-open.png" />
  </Frame>

  ### Major Changes

  1. **Voice ID Structure Redesign**
     * Changed from existing `{character-language-style}` combination → unified to **character-based voice\_id**
     * `language` and `style` parameters separated into body input for flexible calling
  2. **New Model Introduction**
     * Replaced existing `pro`, `turbo` → unified into single **`sona_speech_1`** model
     * Improved speech quality and increased text length limit (200 → 300 characters)
  3. **Cloned Voice API Call Support**
     * Cloned voices created in Play can now be called via API
     * Automatic integration within the same account, maintaining permission-based security
  4. **Play and Pricing Integration**
     * API usage applies Play's credit system directly
     * Shared credits and integrated billing without separate pricing plans
  5. **Enhanced Voice Search Features**
     * Filtering/exploration possible with `GET /voices`, `GET /voices/search` APIs
     * Provides supported languages/styles/samples for each voice
  6. **Predict Duration API Provision**
     * Text length prediction possible before voice generation (no credit deduction)
  7. **New User Guide/Documentation**
     * Complete practical documentation including Quickstart, Voice Selection, Error Handling, FAQ
     * Full documentation renewal considering Play ↔ API integration flow
       Through this update, Supertone API has evolved beyond simple calling functionality to\
       **an organically connected and scalable voice generation platform** for overall service.
</Update>

<Update label="2025-01-23" description="v1.0.1">
  ## Supertone API Search Feature Update

  Hello, thank you for using Supertone API. We're introducing new search features that make it easier to find the voices you want.

  ### New Features

  1. **New endpoint added for searching voices with various filters and keywords**

  * Voice filtering by language, gender, age, and use case
  * Keyword search in voice names and descriptions
  * Result sorting by various criteria
  * Efficient page-based search result viewing

  ### API Endpoints

  1. [Search Voices API](/en/api-reference/endpoints/search-voices): Search and filter voices that match specific conditions

  * Please visit the API reference page to learn more about search parameters and example requests.
  * For detailed information on using the Search Voices API, please refer to the updated documentation.
</Update>

<Update label="2024-12-23" description="v1.0.0">
  <Frame>
    <img src="https://mintcdn.com/supertone-b89202c8/0gAKILFZFHulmmA8/images/supertone-api-landing-page.png?fit=max&auto=format&n=0gAKILFZFHulmmA8&q=85&s=1e13e66b7e2d50b36c928603b7986db5" alt="" width="2880" height="2160" data-path="images/supertone-api-landing-page.png" />
  </Frame>

  ## Supertone API Closed Beta Launch

  Hello, thank you for finding **Supertone API**.
  We're announcing the launch of the **Closed Beta** version of our API service that allows you to use Supertone's voice AI technology.

  ### Key Features

  1. **Text-to-speech** voice synthesis service
  2. Voice list inquiry and usage check API provision

  ### API Endpoints

  1. [Get Voices API](/en/api-reference/endpoints/get-voices): Retrieve list of available voices
  2. [Text-to-speech API](/en/api-reference/endpoints/text-to-voice): Convert text to speech
  3. [Get Voice Usage API](/en/api-reference/endpoints/get-voice-usage): Check API usage

  ### Getting Started

  1. Sign up at [https://console.supertoneapi.com](https://console.supertoneapi.com)
  2. Apply for Closed Beta participation and get approval
  3. Issue API Key from console
  4. Integrate and use API

  ### Pricing Information

  **\$0.1** / 1 minute of generated audio

  ### Console Features

  1. API Key issuance and management
  2. Minute-based API usage monitoring
     For more details, please refer to the [User Guide](/en/user-guide/welcome).
</Update>