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bilibili (Index Team)IndexTTS familyCurrentSpeech and audioReleased 8 Sep 2025

IndexTTS-2 / IndexTTS-2.5 (bilibili)

Model idIndexTeam/IndexTTS-2

PricePrice not published

Checked29 September 2026

Where it stands

86newer speech and audio models since its release

The 5 newest are listed. All speech and audio models

Weights
Weights are public. Licence: bilibili Model Use License Agreement. See the licence for commercial terms.

How to call it

2 ways to use IndexTTS-2 / IndexTTS-2.5 (bilibili), with the model id each provider expects.

Providers, model ids, endpoints and docs for IndexTTS-2 / IndexTTS-2.5 (bilibili)
ProviderModel idEndpointDocs
Hugging Face IndexTeam/IndexTTS-2 huggingface.co
GitHub github.com

Pricing

Price not published.

No price source linked. Checked 29 September 2026.

Specs

Input
Text and audio
Output
Audio
Context window
Not published
Max output
Not published
Open weights
Yes
Licence
bilibili Model Use License Agreement (commercial use by request)
Released
8 September 2025
Status
Current
Type
Speech and audio

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Precise duration control in an autoregressive TTS

    Lets users specify the exact number of speech tokens (useful for dubbing/lip-sync) while keeping AR naturalness, and disentangles speaker timbre from emotion (emotion from a separate reference audio or text).

    Source: huggingface.co

  • IndexTTS-2.5 multilingual

    Found after launch

    2026-08-10 release adds Japanese, Spanish and Arabic to Chinese/English; speed 0.5-2x, Pinyin/CMU/Kana pronunciation control, RTF ~0.2 on RTX 4090.

    Source: github.com

Notes

The IndexTTS2 paper (arXiv June 2025) presents duration control as novel for AR TTS; ‘first’ not independently verified, so not flagged. Weights released 2025-09-08. Commercial use: contact indexspeech@bilibili.com.

Sources: https://github.com/index-tts/index-tts , https://huggingface.co/IndexTeam/IndexTTS-2