TTS-1 HD is a text-to-speech model from OpenAI. OpenAI's higher-quality text to speech, in nine voices. On Leap it runs in one studio beside every other top model, with one account.

Which voices can I use?

9 voices, among them Alloy, Ash, Coral, Echo and Fable. You can hear each one in the studio before you run it.

How much text can it read in one run?

Up to 4,000 characters. You pay for the characters you send, with the price shown before you press go.

How is it different from TTS-1?

TTS-1 HD: OpenAI's higher-quality text to speech, in nine voices. TTS-1: OpenAI's fast text to speech, in nine voices. They all run in the same studio, so you can try one prompt on each.

How much does a run cost?

It costs $0.0405 per 1,000 characters. You see the exact price before you press go, and a run that fails costs nothing.

Is TTS-1 HD free to try?

No. There is no free credit: you add credit from $5, and your first top-up has no card fee. It costs $0.0405 per 1,000 characters. You pay per run, in dollars, with no subscription.

Can I use what I make commercially?

Yes. You own what you make on Leap, so you can use it commercially, and we never train AI on it. The people and brands shown in a result can still have rights in it; the Terms say more.

Yes. Leap's REST API runs it as openai/tts-1-hd, at the same price per run as the studio, and agents can call it through Leap's MCP server. The request is at the bottom of this page.

Do I need an OpenAI account?

No. Leap sends your request to OpenAI's model and gives you what it makes. One Leap account runs TTS-1 HD and every other model, in the studio, through the API and from your agents.

TTS-1 HDAI text to speech

OpenAI's higher-quality text to speech, in nine voices. On Leap, it sits beside 174 other models in one studio.

Text to speech

No subscription
Every top model, one account
Pay per run, priced before it starts

Listen / Onyx

0 / 7 s

Read the transcript

Hi, I'm testing Leap's voices. Can you hear the difference between each one? Let's find out together.

Listen / A maître d' with a warning

0 / 8 s

Read the transcript

Your table is ready. Please follow me, and mind the step. The chef has asked me to tell you that tonight, everything tastes better than it looks.

AI text to speech

TTS-1 HD at a glance

TTS-1 HD is a text-to-speech model from OpenAI. It makes speech from your text.

Made by: OpenAI
Makes: Speech
Starts from: Your text
Voices: 9 to choose from
Text: Up to 4,000 characters
Price: $0.0405 per 1,000 characters
Updated: October 2, 2026

01Write the words, pick a voice
02See the exact price, then press go
03Keep it in your library, or take it further

Pick the right one

TTS-1 HD and its siblings

Model	Best for	Price per run
TTS-1 HD (this page)	OpenAI's higher-quality text to speech, in nine voices.	$0.0405 per 1,000 characters
TTS-1	OpenAI's fast text to speech, in nine voices.	$0.02025 per 1,000 characters

Start with an idea

Three ways to try TTS-1 HD

Side by side

More voice and sound models on Leap

Why Leap

Why creators make it on Leap

01
Every top model, side by side
175 models from Black Forest Labs, Google, ByteDance, Kuaishou, Alibaba and more, side by side in one studio.
See the models
02
One click, or full control
Character Studio, effects and recipes write the prompt for you. Or write your own for any model.
See the tools
03
Your work stays yours
Everything you make stays in your library while your account is active, and you own what you make here.
See what people make
04
One balance for everything
The studio, the API and your agents spend the same balance, and every run shows its price before it starts.
How pricing works

Questions

TTS-1 HD, answered

What is TTS-1 HD?: TTS-1 HD is a text-to-speech model from OpenAI. OpenAI's higher-quality text to speech, in nine voices. On Leap it runs in one studio beside every other top model, with one account.
Which voices can I use?: 9 voices, among them Alloy, Ash, Coral, Echo and Fable. You can hear each one in the studio before you run it.
How much text can it read in one run?: Up to 4,000 characters. You pay for the characters you send, with the price shown before you press go.
How is it different from TTS-1?: TTS-1 HD: OpenAI's higher-quality text to speech, in nine voices. TTS-1: OpenAI's fast text to speech, in nine voices. They all run in the same studio, so you can try one prompt on each.
How much does a run cost?: It costs $0.0405 per 1,000 characters. You see the exact price before you press go, and a run that fails costs nothing.
Is TTS-1 HD free to try?: No. There is no free credit: you add credit from $5, and your first top-up has no card fee. It costs $0.0405 per 1,000 characters. You pay per run, in dollars, with no subscription.
Can I use what I make commercially?: Yes. You own what you make on Leap, so you can use it commercially, and we never train AI on it. The people and brands shown in a result can still have rights in it; the Terms say more.
Is there an API?: Yes. Leap's REST API runs it as openai/tts-1-hd, at the same price per run as the studio, and agents can call it through Leap's MCP server. The request is at the bottom of this page.
Do I need an OpenAI account?: No. Leap sends your request to OpenAI's model and gives you what it makes. One Leap account runs TTS-1 HD and every other model, in the studio, through the API and from your agents.

Your idea, TTS-1 HD.

Every run shows its price before it starts, and one that fails costs nothing.

Make it with TTS-1 HD

For developers

Run TTS-1 HD from code

API docs

Model ID: openai/tts-1-hd
Makes: Voice and sound
Pricing: Per run, quoted first: POST /v1/quotes

Inputs

What the model takes. Leave out anything with a default.

Texttext

Text, up to 4,000 characters, required

Voicevoice

Alloy, Ash, Coral, Echo, Fable, Nova, Onyx, Sage, Shimmer. Default: Alloy

The request

The same envelope for every model; only the model and its input change. With prefer: wait=60 the answer holds the result when the run finishes within a minute; a longer one is read again by its ID. Agents can call it through the MCP server at app.tryleap.ai/api/mcp.

curl https://api.tryleap.ai/v1/generations \  -H "x-api-key: $LEAP_API_KEY" \  -H "content-type: application/json" \  -H "prefer: wait=60" \  -d '{    "model": "openai/tts-1-hd",    "input": {      "text": "Hi, I'\''m testing Leap'\''s voices. Can you hear the difference between each one? Let'\''s find out together."    }  }' # Video often outlasts the wait and answers "queued" or "running".# Put its "id" in GENERATION_ID and read it again until it is done:# curl https://api.tryleap.ai/v1/generations/$GENERATION_ID -H "x-api-key: $LEAP_API_KEY"