Gemini 3.8 Flash TTS
A high-end text-to-speech model from Google that supports natural language voice design, line-by-line performance control, two-speaker dialogue orchestration, and over 100 language dialects. It targets creative content production scenarios.
Core Facts
Timeline (last 90 days)
Voice styles created by users in Flash can be directly reused in Flash-Lite.
Flash-Lite is a lightweight version built on top of Flash, trading some degree of customization freedom for lower costs and higher throughput.
Google has not yet disclosed pricing details, supported language counts, available regions, or specific audio quality comparison data for these two TTS models.
This dual-track strategy causes the intellectual property of voice styles and debugging costs to accumulate on the Flash side, while the marginal production cost is borne by Flash-Lite.
Developers can use Flash-Lite to evaluate costs and Flash to evaluate ceiling performance before deciding on the model selection for the production environment
Gemini 3.8 Flash TTS ranked first overall on Hume AI's Voice Design Benchmark with a score of 71.4, and led in accent modeling with a score of 60.8.
On Hume AI's Overall Quality Index, Gemini 3.8 Flash TTS and Flash-Lite TTS ranked first and second respectively.
Gemini 3.8 Flash TTS is designed for in-depth creative direction and character design, supporting line-by-line performance control including performance prompts, pacing, dialect switching, and back-channel response details.
For general users, Flash TTS is entering Gemini Notebook, and Flash-Lite TTS is integrated into Google Vids.
Voice cloning requires users to provide a verbal consent recording from the voice owner, which must match the reference speaker before the voice can be created.
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All Facts (12)
Gemini 3.8 Flash TTS is designed for in-depth creative direction and character design, supporting line-by-line performance control including performance prompts, pacing, dialect switching, and back-channel response details.
75%UnverifiedThis dual-track strategy causes the intellectual property of voice styles and debugging costs to accumulate on the Flash side, while the marginal production cost is borne by Flash-Lite.
50%UnverifiedVoice styles created by users in Flash can be directly reused in Flash-Lite.
50%UnverifiedFlash-Lite is a lightweight version built on top of Flash, trading some degree of customization freedom for lower costs and higher throughput.
50%UnverifiedGoogle has not yet disclosed pricing details, supported language counts, available regions, or specific audio quality comparison data for these two TTS models.
50%UnverifiedDevelopers can use Flash-Lite to evaluate costs and Flash to evaluate ceiling performance before deciding on the model selection for the production environment
50%UnverifiedThe new TTS models support customizing character, accent, and timbre characteristics through natural language prompts across more than 100 languages and dialects.
50%UnverifiedBoth models support controlling conversation through non-verbal cues such as <laughs>, <sigh>, and <gasp>, as well as active-listening back-channel markers such as |mhm| and |yeah|.
50%UnverifiedVoice cloning requires users to provide a verbal consent recording from the voice owner, which must match the reference speaker before the voice can be created.
50%UnverifiedThe voice library offers more than 2,000 production-ready voices covering regional variants such as Mexican Spanish, Quebec French, and Scottish English.
50%UnverifiedThe voice cloning feature allows users to reconstruct a consistent voice profile from just 30 seconds of audio samples, protected by consent verification, SynthID watermarking, and C2PA credentials.
50%UnverifiedFor general users, Flash TTS is entering Gemini Notebook, and Flash-Lite TTS is integrated into Google Vids.
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