Bilibili open-sources Index-Translate, a 150-language translation model family up to 35B-A3B
Around Sept 30, 2026 Bilibili's Index Team released Index-Translate, an Apache 2.0 translation model family built on Qwen3.5: 2B and 9B dense text models and a 35B-A3B MoE preview covering 150 languages with instruction following (glossaries, formatting, style), plus Index-Echo speech translation, Index-Homura syllable-controlled dubbing and Index-NativeLong document translation models.
Key facts
- Text models: Index-Translate-2B, -9B and -35B-A3B-preview (35B MoE, ~3B active per token), 150 languages, Apache 2.0, on Hugging Face and ModelScope
- Index-Echo S2TT/S2ST (2B, 9B): speech to subtitles or to speech in the source speaker's voice; Index-Homura (2B, 9B): translation to a target syllable count for dubbing; Index-NativeLong (published as Index-Nailong-2B/9B): full-document translation
- Supports hard constraints (format preservation, glossary enforcement) and soft constraints (tone, domain) in translation instructions
- Per AI Weekly's reading of the model card: FLORES COMET-22 0.8794 for the 35B preview; Index-Translate-9B matches or exceeds GPT-5.6 Sol and Gemini 3.5 Flash Lite on WMT26 judge scores and FLORES (vendor claims)
- Hugging Face shows the 35B-A3B preview repo re-uploaded on Oct 2, 2026 (an earlier copy was renamed 'before-replacement'); exact public launch date not confirmed
What happened
Bilibili's Index Team, which also makes the IndexTTS speech models, published Index-Translate, a family of translation models built on Alibaba's Qwen3.5. The text models cover 150 languages and accept translation instructions. Companion models handle speech-to-subtitle and speech-to-speech translation, dubbing (matching syllable counts) and long documents. Weights were released under Apache 2.0.
Why it matters
It is another open-weight Chinese model family built on Qwen. Its dubbing and syllable-control models target video localization, a use specific to platforms like Bilibili.
Changelog
- 2026-10-02: created.
Sources (4)
- codeGitHub: bilibili/Index-Translate
- codeHugging Face: IndexTeam/Index-Translate-35B-A3B-preview
- paperIndex-Translate technical report (arXiv 2609.40181)
- pressAI Weekly: Bilibili open-sources Index-Translate 35B MoE for 150 languages
id: 2026-09-30-bilibili-index-translate · updated 2026-10-02 · open in the interactive timeline