Real-time voice translation has been a hard problem for a long time. Most systems work in turns: wait for the speaker to finish, transcribe, translate, synthesize speech. The result is choppy, robotic, and conversationally awkward. Google just shipped something fundamentally different. Gemini 3.5 Live Translate is a new audio-to-audio model that streams translated speech while the source speaker is still talking, staying just a few seconds behind, and doing it across more than 70 languages.
Not turn-by-turn. Continuous.
Unlike turn-by-turn systems that wait for the speaker to finish speaking before responding, 3.5 Live Translate generates speech continuously, balancing the trade-off between waiting for context to improve quality and translating immediately to stay in sync with the speaker. That tradeoff is the crux of the whole engineering challenge: translate too eagerly and you get garbage because you haven't heard the full sentence; wait too long and the conversation feels like a bad satellite call.
Gemini 3.5 processes streamed audio continuously while retaining enough context to interpret the developing sentence, then generates translated speech with limited delay, balancing immediate output against the need to understand what the speaker means. The model makes split-second decisions about when it has heard enough to commit to a translation.
Beyond just getting the words right, the model automatically detects 70+ languages and generates smooth, natural-sounding translated speech that preserves the speakers' intonation, pacing and pitch. Traditional speech translation often turns spoken language into text, translates the text, and reads the result through a generic text-to-speech voice , a process that can communicate meaning while losing the pauses, emphasis, rhythm, and emotion. Gemini 3.5 Live Translate skips the intermediate text step entirely.
Under the hood
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