Gemini 3.8 Flash TTS

google/gemini-3.8-flash-tts

Accepts compatible input turns: one turn for narration or exactly two distinct voices for multi-turn dialogue (up to 100 turns and 8,192 normalized input bytes). Expressive narration and two-speaker dialogue with 30 voices, delivery instructions, and inline vocal events. Returns WAV audio. Billed by exact spoken characters with no per-request minimum; instructions are not billed. The complete input is limited to 8,192 tokens.

Text to speech

Open in Studio Create an API key

Pricing

Includes our margin. Charged per request from your balance.

Per 1K characters: $0.055

Details

Provider: Google
Added: Nov 5, 2026

Options

Parameters this model accepts.

Voices (30): Zephyr
Puck
Charon
Kore
Fenrir
Leda
Orus
Aoede
Callirrhoe
Autonoe
Enceladus
Iapetus
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Umbriel
Algieba
Despina
Erinome
Algenib
Rasalgethi
Laomedeia
Achernar
Alnilam
Schedar
Gacrux
Pulcherrima
Achird
Zubenelgenubi
Vindemiatrix
Sadachbia
Sadaltager
Sulafat

Use it from the API

Replace $HIDE_API_KEY with a key from the Developers page. Base URL https://hide.st/api/v1.

curl https://hide.st/api/v1/audio/speech \
  -H "Authorization: Bearer $HIDE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-3.8-flash-tts",
    "input": "Hello! This is a quick test of text to speech.",
    "voice": "Zephyr"
  }' \
  --output speech.mp3

Pricing

Details

Options

Use it from the API

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