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Gemini 3.8 text-to-speech models now available on AI Gateway

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Gemini 3.8 Flash-Lite TTS and Gemini 3.8 Flash TTS from Google are now available on AI Gateway.

Both models take text and generate speech in more than 100 languages. They support long-form narration, control over delivery, and two-speaker dialogue.

  • google/gemini-3.8-flash-lite-tts is suited to high-volume speech generation, with controls for tone, pacing, and line-by-line delivery.

  • google/gemini-3.8-flash-tts adds voice and character design through natural-language prompts, including acting cues, accents, and conversational reactions.

import { experimental_generateSpeech as generateSpeech } from 'ai';
import { writeFile } from 'node:fs/promises';


const result = await generateSpeech({
  model: 'google/gemini-3.8-flash-lite-tts',
  text: 'Welcome to the audio edition.',
  voice: 'Kore',
  outputFormat: 'wav',
});


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

Generate and listen to speech in the Flash-Lite TTS playground or the Flash TTS playground. For setup instructions and more code examples, see the speech quickstart and text-to-speech guide.

AI Gateway provides one API for speech generation alongside your other models, with usage and cost tracking for each request. You can configure routing rules and bring your own provider key.