Model reference · open weights
supertonic-3 is an open-weight audio or speech model from Supertone, listed in the AxForge catalogue. AxForge can bring it up on EU-owned hardware for you on request — with the licence handled where one is required.
About
Supertonic 3 | Lightning Fast, On-Device, Accurate TTS Supertonic is a lightweight text-to-speech system for local inference. It runs with ONNX Runtime entirely on your device, with no cloud call required for synthesis. Supertonic 3 expands the open-weight release from 5 to 31 languages, improves reading stability, and reduces repeat/skip failures. Quick Start Install the Python SDK and generate speech immediately. On first run, the SDK downloads the model assets from Hugging Face. What's New in Supertonic 3 - 31 languages: expanded from the 5-language Supertonic 2 release. - More stable reading: fewer repeat and skip failures, especially on short and long utterances. - Higher speaker similarity: improved similarity across the shared-language set compared with Supertonic 2. - Expression tags: supports simple tags such as <laugh, <breath, and <sigh. Custom Voices and Audio Samples The open-weight package includes fixed preset voice styles for immediate local inference. If you want to hear how Supertonic 3 performs with zero-shot custom voice styles, visit the Audio Sample Demo to compare reference audio and generated speech across several use cases. To create your own Supertonic 3 voice-style JSON from reference audio, use Supertonic Voice Builder; purchased Voice Builder styles include downloadable embeddings for both Supertonic 2 and Supertonic 3. Here are a few reference/generated pairs from the audio sample demo: Call center, English Text: Good morning, thank you for calling. How can I help you today? Character voice, Japanese Text: ふふっ、退屈してたところなの。ちょうどいい遊び相手、見つけたかも♪ Elder character voice, Korean Text: 혼자 떠나기엔 길이 험하구나. 이 낡은 검을 가져가거라. 언젠가 어둠이 네 이름을 부르더라도, 부디 빛을 잊지 말거라. Audiobook, English Text: I was not afraid of silence. I had lived with it long enough to know that, sometimes, it speaks more honestly than people do. Audiobook, Japanese Text: その朝、ロンドンの霧はいつになく低く垂れこめていた。私はただの訪問者だと思っていたが、ホームズの目はすでに別の結論にたどり着いていた。 News, English Text: Here’s a story worth paying attention to. Supertone has released Supertonic 3, its on-device TTS model. This version expands support to thirty-one languages and improves reading stability. Performance Highlights Supertonic 3 is designed
Summarised from the published model card. Read the full card on the HuggingFace links below.
Specifications
| Maker | Supertone |
|---|---|
| Type | Audio & music |
| Variants | 1 |
| Runs with | supertonic |
| Released | 2026-05-06 |
| Popularity | 28k downloads / month |
| Likes | 936 |
| Licence | Open weights |
How it works
Variants
Open weights ship in several sizes and precisions. One page, all the variants — pick the one that fits your GPU. VRAM figures are estimates from model size.
| Variant | Params | Precision | VRAM | Fits 16 GB | Weights |
|---|---|---|---|---|---|
| supertonic-3 | — | BF16 | — | — | Weights ↗ |
Using it via the API
Once AxForge deploys supertonic-3 for you, it answers on the OpenAI-compatible API — the same base URL and keys as every other model. (supertonic-3 below is illustrative; you get the exact model name on deployment.)
$ curl -sS https://api.axforge.ai/v1/audio/transcriptions \ -H "Authorization: Bearer $AXFORGE_API_KEY" \ -F model="supertonic-3" -F file=@audio.mp3
Details
Languages
Tags
Licence
Open weights under openrail — commercial use is permitted. Deploy it on AxForge EU hardware on request. Read the licence ↗