The authors introduce Index-Translate, a multilingual translation model family combining a shared foundation with specialized training for general translation, instruction following, speech translation, controlled dubbing, and long-document translation. The family includes 2B, 9B, and 35B-A3B models supporting 150 languages.
- Index-Translate outperforms comparable-size translation models and matches 100B-scale or frontier models in general and complex instruction tasks.
- Index-Echo provides end-to-end speech-to-text and speech-to-speech translation, surpassing existing end-to-end models and matching frontier omni models.
- Index-Homura enables syllable-controlled dubbing.
- Index-NativeLong introduces native long-document translation with a dedicated benchmark.
These capabilities support diverse translation tasks, including multilingual content production.