Skip to content
xAI

Grok TTS

Grok TTS is xAI's text-to-speech model with five expressive voices, speech tags, and telephony codec support, available through Vercel AI Gateway.

index.ts
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('xai/grok-tts'),
  text: 'Hello from the Vercel AI Gateway!',
  voice: 'eve',
});


await writeFile('speech.mp3', result.audio.uint8Array);
OverviewAboutProvidersSimilarFAQ

Frequently Asked Questions

  • How many voices does Grok TTS offer?

    Grok TTS offers five expressive voices, such as eve. Set the voice option in generateSpeech to choose one.

  • What are speech tags in Grok TTS?

    Speech tags are controls for expression and delivery in generated speech. Combined with the expressive voices, they let you adjust how Grok TTS reads your text.

  • What audio formats does Grok TTS support?

    Set outputFormat to a format like mp3 or wav. Grok TTS also supports telephony codecs for phone-system audio, and unsupported options are reported in warnings.

  • How do I generate speech with Grok TTS?

    Use the AI SDK's experimental_generateSpeech function with your text, a voice, and an outputFormat, then save result.audio.uint8Array. A REST endpoint returns base64-encoded audio if you're not using the AI SDK.

  • What does Grok TTS cost?

    Billing is per input character, so cost scales with text length. See the pricing panel on this page for current rates.

  • How do I authenticate with Grok TTS through Vercel AI Gateway?

    Use your Vercel AI Gateway API key with xai/grok-tts as the model identifier. AI Gateway handles provider routing automatically.

  • Does Vercel AI Gateway support Zero Data Retention for Grok TTS?

    Zero Data Retention is not currently available for this model. Zero Data Retention is offered on a per-provider basis. See https://vercel.com/docs/ai-gateway/capabilities/zdr for details.