As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/vui-luna-tts/

# VUI Labs Luna-TTS (and Luna-TTS Realtime)

VUI Labs, Luna-TTS family. Status: current. Type: speech and audio. Released: 2026-06.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| VUI Labs API |  |  | https://www.vuilabs.ai/ |
| arXiv (technical report) |  |  | https://arxiv.org/abs/2608.11593 |

## Pricing

- Per 1M characters: $15
- Unit as published: USD per 1M characters (Luna-TTS and Luna-TTS Character); voice cloning $3 per clone
- Source: https://www.vuilabs.ai/
- Last checked: 2026-09-29

## Specs

- Input: text, audio
- Output: audio
- Context window: not published
- Max output: not published
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer speech and audio models in the registry since its release: 50. The 5 newest:
  - NVIDIA Nemotron 3.5 Transcribe (30B-A4B) (2026-10-28) https://postcutoff.com/m/nemotron-3-5-transcribe/
  - Hy-SimulMT-30B-A3B (2026-10-22) https://postcutoff.com/m/hy-simulmt-30b-a3b/
  - Eleven Realtime v1 Max / Mini (2026-10-20) https://postcutoff.com/m/eleven-realtime-v1-max/
  - Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3) (2026-10-20) https://postcutoff.com/m/voxtral-mini-transcribe-3/
  - Voxtral Small Transcribe 3 (2026-10-20) https://postcutoff.com/m/voxtral-small-transcribe-3/
- Closed weights.

## What stands out

- Diffusion-language-model TTS (non-autoregressive): Generates the whole RVQ token grid in a fixed number of parallel refinement steps; the Realtime variant is blockwise-autoregressive over 1.28 s blocks (RTF 0.0240, 41.6 ms first-block latency locally). 0.6B backbone, ~1M hours of zh/en/ja/ko speech. Source: https://arxiv.org/abs/2608.11593
- Chinese startup at the top of TTS arenas (found after launch): Pandaily (Aug 2026) reported #1 on Hugging Face TTS Arena and #3 on Artificial Analysis Speech Arena; on 2026-09-29 AA shows it #8 (Elo 1230). Source: https://pandaily.com/vui-labs-luna-tts-number-one-tts-arena-qian-yanmin-voice-agent-aug2026

## Notes

Chinese voice-AI startup (Pandaily). Release month June 2026 per the Artificial Analysis leaderboard; technical report 2026-08-12 (Feng Yin et al., 22 authors). Supports zero-shot cloning, speech editing, emotion control, non-verbal vocalisations. We found no statement about open weights. Pandaily headline calls it China's 'Thinking Machines' and names Qian Yanmin (role not verified). Not the same as fluxions-ai 'Vui' (open Apache-2.0 small TTS).

Sources: https://arxiv.org/abs/2608.11593 , https://www.vuilabs.ai/ , https://artificialanalysis.ai/text-to-speech/model-families/luna-tts

Model page: https://postcutoff.com/m/vui-luna-tts/