Gemini 3.8 Flash TTS

Gemini 3.8 Flash TTS is Google’s text-to-speech model for expressive voice generation and custom character design across more than 100 languages. It creates original voices from natural language prompts and offers granular control over acting cues, pacing, accents, and conversational reactions. Long-form audio and native two-speaker dialogue make it well suited to immersive audiobooks, games, podcasts, and interactive media Your use is subject to Google's Terms & Privacy Policies.

Input and output price 50% off: Input $0.50, Output $9, Per 1M tokens

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// Requires ai@7 and @ai-sdk/gateway@4.
import { experimental_generateSpeech as generateSpeech } from 'ai';
import { gateway } from '@ai-sdk/gateway';
import { writeFile } from 'node:fs/promises';

const result = await generateSpeech({
  model: gateway.speechModel('google/gemini-3.8-flash-tts'),
  text: 'Hello from the Vercel AI Gateway!',
  voice: 'Kore',
  outputFormat: 'wav',
});

await writeFile('speech.wav', result.audio.uint8Array);

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Overview Playground Providers Similar

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Try out Gemini 3.8 Flash TTS by Google. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.

Gemini 3.8 Flash TTS

Text

The text the model will read aloud.

Voice

Your generated audio will appear here

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Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.

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Provider

Input	Capabilities	ZDR	No Training	Free Tier	Release Date

Google

50% off

Legal:Terms•Privacy

$0.50/M chars

09/23/2026

Copy link to headingMore models by Google

Model

Context	Latency	Throughput	Input	Output	Cache	Web Search	Capabilities	Providers	ZDR	No Training	Free Tier	Release Date

google/gemini-3.8-flash

1.8 s

345 tps

$0.75/M

$3.75/M

Read$0.08/M

$14/K+1 more

09/02/2026

google/gemini-3.7-flash

1.9 s

281 tps

$0.75/M

$3.75/M

Read$0.08/M

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08/13/2026

google/gemini-3.5-flash-lite

0.6 s

443 tps

$0.30/M

$2.50/M

Read$0.03/M

$14/K+1 more

07/21/2026

google/gemini-3.1-flash-lite

0.9 s

214 tps

$0.25/M

$1.50/M

Read$0.03/M

$14/K+1 more

05/07/2026

google/gemini-3-flash

0.6 s

185 tps

$0.50/M+1 more

$3/M+1 more

Read$0.05/M

$14/K+1 more

12/17/2025

google/gemini-2.5-flash-lite

0.3 s

282 tps

$0.10/M

$0.40/M

Read$0.01/M

$35/K+1 more

06/17/2025