Model overview
IndexTTS-2.5 is a zero-shot text-to-speech model that clones a voice from a single reference audio clip. It supports **Chinese, English, Japanese, Spanish and Arabic**, with cross-lingual voice transfer and emotion control disentangled from timbre. Compared with IndexTTS-2, it adds Japanese, Spanish and Arabic, infers faster, adds speaking speed control, and improves controllability of Chinese Pinyin, English CMU phonemes and Japanese Kana. - **Developed by:** IndexTeam, Bilibili - **Model type:** Autoregressive zero-shot TTS — GPT backbone, flow-matching speech-to-mel decoder, BigVGAN vocoder - **Parameters:** ~0.8B (GPT backbone) - **Languages:** Chinese, English, Japanese, Spanish, Arabic - **Output:** 22.05 kHz waveform - **License:** bilibili Model Use License Agreement - **Repository:** github.com/index-tts/index-tts - **Paper:** arXiv:2601.03888
Key features
特点摘要待依据来源补齐，不凭模型名称推断能力。
Limitations & considerations
Sources are insufficient to establish specific limitations. Verify task performance, latency, data policies, licensing and version lifecycle.
Source prices & cost analysis
Prices vary by channel, region and configuration. Channel quotes are listed independently and are not treated as a single official provider price.
| Source / channel | Input | Output | Billing unit | Collected at |
|---|---|---|---|---|
| No verified prices yet. Check the source channel. | ||||
Estimate monthly base token costs
Estimates exclude cache discounts, tiered pricing, multimodal surcharges, web search, taxes and additional reasoning output.
Public benchmarks & run configuration
暂无已采集的可核验公开评分。模型未上榜不代表能力较低。
View full indexed rankings →Frequently asked questions
Do open weights permit free commercial use?
Not necessarily. Check the version license, commercial conditions and usage policies. Self-hosting incurs compute and maintenance costs.
Are these real-time billing prices?
These are timestamped source snapshots, not live billing prices. Check the channel for current versions, regions, discounts and billing methods.
Sources & traceability
许可证：other。模型介绍与第三方评测均以原来源的具体版本和方法为准。