TTS-1

Text-to-Speech • OpenAI • Proxied

OpenAI's text-to-speech model optimized for real-time use with low latency.

Model Info
Terms and License	link ↗
More information	link ↗
Pricing	View pricing in the Cloudflare dashboard ↗

Usage

const response = await env.AI.run(
  'openai/tts-1',
  {
    text: 'Hello! Welcome to Cloudflare AI Gateway. Let me show you what we can do.',
    voice: 'alloy',
    response_format: 'mp3',
    speed: 1,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "audio": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/openai__tts-1/simple-speech.mp3"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Examples

Different Voice — Use the Nova voice for a different tone

const response = await env.AI.run(
  'openai/tts-1',
  {
    text: 'The weather today is sunny with a high of 72 degrees. Perfect for a walk in the park.',
    voice: 'nova',
    response_format: 'mp3',
    speed: 1,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "audio": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/openai__tts-1/different-voice.mp3"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Narration — Slower narration style with the Onyx voice

const response = await env.AI.run(
  'openai/tts-1',
  {
    text: 'In the beginning, the universe was a singularity of infinite density. Then, in a fraction of a second, it expanded into everything we know today.',
    voice: 'onyx',
    response_format: 'mp3',
    speed: 0.85,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "audio": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/openai__tts-1/narration.mp3"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Echo Voice — Use the Echo voice for a deeper tone

const response = await env.AI.run(
  'openai/tts-1',
  {
    text: 'Welcome back to the podcast. Today we are going to talk about the future of artificial intelligence and its impact on creative work.',
    voice: 'echo',
    response_format: 'mp3',
    speed: 1,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "audio": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/openai__tts-1/echo-voice.mp3"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Fast Playback — Speed up speech for quick listening

const response = await env.AI.run(
  'openai/tts-1',
  {
    text: 'This is a fast-paced summary of the key findings from the quarterly report. Revenue is up fifteen percent, user growth exceeded expectations, and infrastructure costs remain stable.',
    voice: 'shimmer',
    response_format: 'mp3',
    speed: 1.5,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "audio": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/openai__tts-1/fast-playback.mp3"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

text

stringrequiredmaxLength: 4096The text to generate audio for. Maximum length is 4096 characters.

voice

stringrequireddefault: alloyenum: alloy, echo, fable, onyx, nova, shimmerThe voice to use when generating the audio. Defaults to alloy.

response_format

stringrequireddefault: mp3enum: mp3, opus, wav, aac, flacThe output format for the audio. Supported formats are mp3, opus, wav, aac and flac.

speed

numberrequireddefault: 1minimum: 0.25maximum: 4The speed of the generated audio. Select a value from 0.25 to 4.0. 1.0 is the default.

audio

stringURL to the generated audio file

API Schemas (Raw)

Input

Output