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Back to models

Standard TTS

openai/tts-1

TTS-1 — speech at 32 credits per 1,000 characters

OpenAI's TTS-1 turns text into natural speech fast enough to stream back to a caller. The standard-quality tier; TTS-1 HD costs twice as much for a warmer result.

Modalities
Input / Output
32 / 0cr / 1K
Available voices
10
Rate limit
50 RPM
Capabilities
  • Streaming

What this model does well

  • 🎙️

    10 voices

    Varied male and female voices

  • ⚡

    Real-time

    Streaming audio, instant playback

  • 🌍

    Multilingual

    Works in French, English and 30+ languages

  • 🎛️

    Adjustable speed

    From 0.25x to 4x normal speed

Example prompts

  • Welcome to Ali Sandwiches! Our sandwiches are made with fresh ingredients every day.

  • Special promotion! 30% off all our menus this week.

Technical specifications

Author
openai
API identifier
tts-1
Category
Audio
Available voices
alloy, ash, ballad, coral, echo, fable, nova, onyx, sage, shimmer
Rate limit
50 RPM
Billing unit
character

Ideal for

  • Voice assistants and IVR
  • Reading articles aloud
  • Accessibility narration
  • Audio ads
  • Podcast drafts

Ready to try it?

Test this model in the playground, no setup needed.

Frequently asked questions

Can I pay with mobile money, without a bank card?

Yes. Top up your Tchavi account with Orange Money, MTN MoMo, M-Pesa or another mobile money operator. No bank card is needed. Credits land as soon as the payment is confirmed and are deducted as you use them.

Is the API compatible with OpenAI's?

Yes. Keep your current OpenAI SDK, just change the base URL to Tchavi's (shown in the API tab) and use your Tchavi key. The rest of your code stays the same.

API

import Tchavi from '@tchavi/sdk';
import fs from 'fs';

const client = new Tchavi({ apiKey: 'API_KEY' });

const response = await client.audio.speech.create({
  "model": "tts-1",
  "input": "Hello, world!",
  "voice": "alloy",
  "response_format": "mp3"
});

const buffer = Buffer.from(await response.arrayBuffer());
fs.writeFileSync('speech.mp3', buffer);
console.log('X-Credits-Used:', response.headers.get('x-credits-used'));

API parameters

Every parameter this model accepts on the API. Check the SDK for full typings.

modelRequired
string

TTS model (e.g. `tts-1`).

inputRequired
string

The text to synthesize.

voiceRequired
string

Voice timbre: `alloy`, `ash`, `ballad`, `cedar`, `coral`, `echo`, `fable`, `marin`, `nova`, `onyx`, `sage`, or `shimmer`.

response_format
"mp3" | "opus" | "aac" | "flac" | "wav" | "pcm"
Default: "mp3"

Audio container format.

Show all parameters (5)
speed
number (0.25–4.0)
Default: 1.0

Playback speed multiplier.

Pricing

per 1,000 characters
32 credits

How billing works

  • Billed per thousand characters.
  • A typical generation costs about —, or 32 credits.
Per day
Per week
Per month
A 10 000 F CFA top-up gives you about ~937 thousand characters. Pay with Orange Money, MTN MoMo or M-Pesa — no Visa card needed.

Ready to use Standard TTS?

Create your accountAPI Documentation

Bonus credits on your first top-up · No card to sign up