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Gemini 3.8 Flash TTS

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Google's text-to-speech model for directed, expressive speech, with voice design from a written description and 130 languages

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About Gemini 3.8 Flash TTS

Google's Gemini 3.8 Flash TTS turns written text into speech and is built for production audio work. A voice can be shaped from a plain-language description of how it should sound, and each line's delivery can be directed.

On Artificial Analysis's Provider Voice Arena it ranked second when read on 24 September 2026, and arena ratings shift as votes arrive.

What Gemini 3.8 Flash TTS does

  • Voice design: builds a voice from a written description.
  • Directed delivery: sets how each line is spoken, and generates two-speaker scenes natively.
  • Long-form audio: supports long-form audio output.
  • Voice replication: copies a voice from a 30-second sample after a consent check, except in the UK, the EEA, Switzerland, India, Illinois and Texas.
  • Ready-made voices: more than 2,000 built-in voices to choose from.

Key facts

  • Languages: 130 languages.
  • Input limit: 8,192 tokens.
  • Output limit: 16,384 tokens.
  • Not supported: function calling, structured output or grounding.
  • Watermark: output carries Google's SynthID watermark.
  • Free-tier data: Google's pricing page says free-tier use may be used to improve its products, while paid-tier use is not.

Profile written by TrustList from the business's own published information, Oct 2026.

Benchmarks & AI stats

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Trust Score

4/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
18/100 · 20%
Engagement
0/100 · 15%
Joining soon
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Updated 9/24/2026

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