Gemini 3.8 Flash TTS
Turn any script into a directed performance with Gemini 3.8 Flash TTS — design voices, stage two speakers and ship audio in 130 languages.
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What Sets Gemini 3.8 Flash TTS Apart in Voice Production
Launched September 23, 2026, the Gemini TTS family pairs a creative flagship with a budget-minded workhorse built for bulk audio.
- A Single Release, Two Clear Use CasesGemini 3.8 Flash TTS handles expressive, high-fidelity work, while Flash-Lite TTS keeps large speech batches affordable.
- Steer Every Line Instead of Picking a PresetPer-turn style notes, structured speech metadata and inline vocal cues control tone, tempo, emotion and accent.
- Build New Voices or Replicate With ConsentDescribe the voice you want in plain words, or reproduce a real speaker using a reference clip plus a matching consent recording.
How to Prompt Gemini 3.8 Flash TTS
Four simple habits that keep your transcript clean and let the performance metadata do the heavy lifting.
Inside Gemini 3.8 Flash TTS: A Full Capability Breakdown
Performance control, voice creation, safety layers and language reach — here is what this Gemini TTS flagship actually delivers.
Line-by-Line Performance Control
Per-turn styling with inline laughs, sighs, coughs, breaths and pauses feels like coaching an actor, not picking a stock preset.
Describe a Voice, Get That Voice
Write down age range, personality, accent, vocal texture and role, then tap 2,000+ production voices through the Voices endpoint.
Voice Replication Behind a Consent Gate
Requires a clean reference recording plus a matching consent recording from the same adult speaker, with SynthID watermarking and C2PA credentials.
Two-Voice Dialogue Staging
Write the exchange once and it fits podcasts, teaching dialogues, product demos and game scenes — no manual line stitching.
Steady Voice Across Long Recordings
Google reports consistent identity, timbre, loudness and room tone across multi-minute narration and extended dialogue.
130 Languages With Regional Accents
Flash TTS spans 130 languages versus Flash-Lite's 101, covering regional accents, minority dialects and IPA pronunciation overrides.
Gemini 3.8 Flash TTS: Your Questions Answered
Quick answers about pricing, model selection, benchmark scores and safety rules for Gemini 3.8 Flash TTS.
What does Gemini 3.8 Flash TTS cost per audio minute?
Roughly 1.35 cents per audio minute, based on launch pricing of $0.50 per million input tokens and $9 per million output tokens.
When should I pick Flash TTS over Flash-Lite TTS?
Choose Flash TTS when acting nuance and long-form narration matter; reach for Flash-Lite TTS for high-volume output and low latency.
How does it stack up against rival voice models?
Google cites a 71.4 score on Hume's Voice Design Benchmark, and Voice Arena ranks it second with 1,260 Elo.
What changed from Gemini 3.1 Flash TTS Preview?
Flash-Lite TTS takes over from the 3.1 preview and drops audio output pricing from $20 to $6 per million tokens.
Can I clone a voice, and what safeguards apply?
Yes, but replication needs a reference clip plus a matching consent recording from the same adult speaker.
Why is the model reading my stage directions aloud?
Because the input is treated as a verbatim transcript — shift lasting directions into the speech metadata field instead.
Run Your Own Scripts Through Gemini 3.8 Flash TTS
Test both tiers in the Gemini API or Google AI Studio — switching between Gemini 3.8 Flash TTS and Flash-Lite TTS takes nothing more than a new model identifier. Weigh batch against priority inference before you lock in a production budget.