Bilibili's open-source, industrial-grade zero-shot speech cloning model, IndexTTS-2.5.

Bilibili's open-source industrial-grade zero-shot speech cloning model, IndexTTS-2.5, has only 0.8B parameters and supports cross-language transfer in five languages: Chinese, English, Japanese, Spanish, and Arabic. The model features a redesigned inference architecture, resulting in a 2.28x speedup and a real-time performance rate as low as 0.20. It also supports stepless speech rate adjustment from 0.5x to 2.0x and provides pronunciation intervention at three granularities: Pinyin, CMU phonemes, and Japanese kana.