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Gemini 3.8 Flash TTS: AI Audio & Music

Generate expressive multi-speaker speech with Gemini 3.8 Flash TTS. Studio-grade voice fidelity and long-form stability. Try free, pay per use. Gemini 3.8 Flash TTS turns written dialogue into expressive, natural multi-speaker speech with studio-grade voice fidelity, expressive acting, and long-form stability. Control voice, accent, emotional style, and pace per speaker for fast, affordable voiceovers, character dialogue, and narration.

Interactive model controls

Gemini 3.8 Flash TTS turns written dialogue into expressive, natural multi-speaker speech with studio-grade voice fidelity, expressive acting, and long-form stability. Control voice, accent, emotional style, and pace per speaker for fast, affordable voiceovers, character dialogue, and narration.

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Aperçu

À propos de ce modèle

Gemini 3.8 Flash TTS is Google's newer-generation text-to-speech model, built for studio-grade voice fidelity, expressive acting, and long-form stability. Define any number of speakers, each with a distinct voice, accent, emotional style, and pace, then script a conversation across ordered dialogue turns with inline tone tags like [whispers] or [shouting]. It is ideal for character dialogue, game and video voiceovers, podcasts, and narration where you need natural, expressive delivery at speed. For even lower latency and cost on high-volume workloads, see Gemini 3.8 Flash Lite TTS; for premium studio-quality output, see Gemini 2.5 Pro TTS.

1Games & Interactive: Voice NPCs and branching dialogue with distinct, emotionally-directed characters.
2Video & Shorts: Generate expressive, studio-grade voiceovers and character lines for content production.
3Podcasts: Produce multi-host conversational audio from a written script.
4Prototyping: Iterate quickly on tone, accent, and pacing before a final high-fidelity render.
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Prix ​​et valeur

Analyse des coûts

muapiapp$0.015 per 1,000 characters

Pay per generation, no subscription. Matches Google's official Gemini 3.8 Flash TTS audio-output rate.

Fal.aiNon disponible

Ne propose pas ce modèle.

ReplicateNon disponible

Ne propose pas ce modèle.

** Les prix des concurrents sont estimés sur la base d'architectures de modèles et de niveaux d'utilisation similaires.

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Détails techniques

Schéma de configuration

Haut-parleursarray

. IDENTIFIANT .

Valeur par défaut[object Object],[object Object]
Les dialogues tournentarray

. haut-parleur_id . [criant] [chuchotant] .

Valeur par défaut[object Object],[object Object],[object Object],[object Object]
scènestring

Optional scene description that sets the acoustic setting, e.g. "A quiet, warm room with a fireplace crackling softly."

Valeur par défaut
Exemple de contextestring

Optional overall tone/style, e.g. "Audiobook style narration. Tone is gentle and inviting."

Valeur par défaut
Températurenumber

(0-2) . , .

Valeur par défaut1
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Guide de mise en œuvre

Documentation du développeur

How to Use Gemini 3.8 Flash TTS

  1. Define your speakers: Add one entry per voice to the speakers list. Give each a speaker_id in "Speaker N" format, pick a voice_name, and set the accent, style, and pace. Optionally add an audio_profile describing the persona.

  2. Write the dialogue: Fill dialogue_turns with ordered lines. Each turn's speaker_id must match a speaker you defined. You can embed tone tags inline such as [whispers], [shouting], or [determination].

  3. Set the mood (optional): Use scene to describe the acoustic setting and sample_context to set the overall narration tone. Adjust temperature (0-2) for more or less varied delivery.

  4. Submit and poll: POST the request, then poll /predictions/{request_id}/result until the status is completed to get the audio URL.

curl -X POST https://api.muapi.ai/api/v1/gemini-3-8-flash-tts \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "speakers": [
      {"speaker_id": "Speaker 1", "voice_name": "Fenrir", "accent": "British (RP)", "style": "Deadpan", "pace": "Natural"},
      {"speaker_id": "Speaker 2", "voice_name": "Puck", "accent": "American (Gen)", "style": "Empathetic", "pace": "Staccato"}
    ],
    "dialogue_turns": [
      {"speaker_id": "Speaker 1", "text": "[shouting] Halt, traveler!"},
      {"speaker_id": "Speaker 2", "text": "[determination] I carry a message for the elder."}
    ],
    "scene": "A dark, crumbling dungeon.",
    "temperature": 1
  }'
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Questions courantes

Foire aux questions

How do I create a multi-speaker conversation?

Define each voice in the `speakers` list with a unique `speaker_id` (in "Speaker N" format), then reference those IDs in your `dialogue_turns`. The model renders each line in that speaker's assigned voice, accent, style, and pace.

Can I control emotion and pacing?

Yes. Each speaker has `style` (Vocal Smile, Newscaster, Whisper, Empathetic, Promo/Hype, Deadpan) and `pace` (Natural, Rapid Fire, The Drift, Staccato) settings. You can also embed inline tone tags like [whispers], [shouting], or [determination] directly in the dialogue text.

What voices and accents are available?

There are 30 prebuilt voices (Zephyr, Fenrir, Puck, Kore, and more) and 8 accents including Neutral, American variants, British (RP), British (Brixton), Transatlantic, and Australian.

How is pricing calculated?

Pricing is based on the total number of characters across all dialogue turns, at $0.015 per 1,000 characters — matching Google's official Gemini 3.8 Flash TTS audio-output rate. You pay per generation with no subscription.

What is the maximum length per line?

Each dialogue turn's text can be up to 10,000 characters. You can include multiple turns to build longer conversations.

How does this differ from Gemini 3.1 Flash TTS and Gemini 3.8 Flash Lite TTS?

Gemini 3.8 Flash TTS is Google's newer generation Flash tier, tuned for studio-grade voice fidelity, expressive acting, and long-form stability at a lower cost than the 3.1 line. Gemini 3.8 Flash Lite TTS trades a little fidelity for even lower latency and cost on high-throughput, conversational workloads.