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Google: Gemini 3.8 Flash TTS

Source description (English)

Gemini 3.8 Flash TTS is a text-to-speech model from Google and the successor to Gemini 3.1 Flash TTS Preview. It is the creative tier of the 3.8 TTS family, suited...

View source on OpenRouter
Overview

Model specifications

Context
32,768 tokens
Maximum output
16,384 tokens
Architecture
text->speech
Tokenizer
Gemini
Knowledge cutoff
Not provided
Moderated
No
OPENROUTER

Complete pricing

Synchronized OpenRouter rates. Token prices are shown per one million tokens.

Input
$0.5
per million text tokens
Output
$9
per million audio tokens
API

Model configuration

Supported voices

ZephyrPuckCharonKoreFenrirLedaOrusAoedeCallirrhoeAutonoeEnceladusIapetusUmbrielAlgiebaDespinaErinomeAlgenibRasalgethiLaomedeiaAchernarAlnilamSchedarGacruxPulcherrimaAchirdZubenelgenubiVindemiatrixSadachbiaSadaltagerSulafat
API

Quick start

Set OPENROUTER_API_KEY locally. Python requires requests; JavaScript runs in Node.js. Keep the key on the server.

Choose a supported voice. Replace YOUR_VOICE_ID if no voice is listed.

API documentation

curl --fail-with-body https://openrouter.ai/api/v1/audio/speech \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"google/gemini-3.8-flash-tts","input":"Hello!","voice":"Zephyr","response_format":"mp3"}' \
  --output speech.mp3
Capabilities

Input → Output

Input
text
Output
speech
API

Supported API parameters

Available providers

1 Provider

Checked: October 2, 2026

Live providers on OpenRouter

Provider availability, latency, throughput and routing can change continuously. Open the source page for current operational data.

OpenRouter

Google AI Studio

Not provided
Context
33K
Maximum output
16K
google

4 models

All models
google logogoogle

Google: Gemini 4 Argon

Gemini 4 Argon is Google's flagship reasoning model, built for complex software engineering, deep mathematical and scientific problem solving, and autonomous multi-step agents. Google trained it to keep context across...

Context
1.0M
Input
audio · file · image · text · video
Output
text
Input: $2Output: $10per 1M tokens
View model details →
google logogoogle

Google: Gemini 4 Argon (batch)

Gemini 4 Argon is Google's flagship reasoning model, built for complex software engineering, deep mathematical and scientific problem solving, and autonomous multi-step agents. Google trained it to keep context across...

Context
1.0M
Input
audio · file · image · text · video
Output
text
Input: $1Output: $5per 1M tokens
View model details →
google logogoogle

Google: Nano Banana 2.1

Nano Banana 2.1 (Gemini Nano Banana 2.1) is Google's image generation and editing model on the Flash tier, succeeding Nano Banana 2 and Nano Banana Pro. It improves product recontextualization,...

Context
66K
Input
image · text
Output
image · text
Input: $1.5 per 1M tokensOutput: $7.5 per 1M tokens
View model details →
google logogoogle

Google: Gemini 3.5 Transcribe

Gemini 3.5 Transcribe is a speech-to-text model from Google. It is suited for synchronous transcription that needs word-level timestamps or speaker diarization, with support for up to eight speakers. Audio...

Context
98K
Input
audio
Output
transcription
Input: $2 per 1M tokensOutput: $12 per 1M tokens
View model details →