TTS-1

Name: TTS-1
Author: OpenAI

by OpenAI

OpenAI's legacy low-latency speech model.

TTS-1 favors speed over maximum fidelity and uses the classic OpenAI voice set.

More details

TTS-1 by OpenAI is a fast-speed AI text-to-speech model. TTS-1 favors speed over maximum fidelity and uses the classic OpenAI voice set. Key capabilities include 78 voices across 7 languages, up to 4,096 characters per request.

TTS-1 is priced at $0.02 per 1,000 characters of input text. You can generate speech with TTS-1 on idapt.app alongside 200+ AI models in one workspace.

Voices

9 · 1 languages

Any of these voices can be paired with TTS-1. Pick a model for quality and speed, a voice for character and language.

Alloy

Multilingual · Neutral

Ash

Multilingual · Neutral

Coral

Multilingual · Neutral

Echo

Multilingual · Male

Fable

Multilingual · Neutral

Onyx

Multilingual · Male

Nova

Multilingual · Female

Sage

Multilingual · Neutral

Shimmer

Multilingual · Female

Pricing

Cost per 1,000 characters

$0.02

Typical paragraph (~500 chars)

$0.009

Billed on input text length

Capabilities

Speed

Fast: Low-latency, real-time ready

Emotion Control

Natural delivery only

Max Input

4,096 characters per request

Voices

9 voices · 1 languages

Generate speech with TTS-1 View Details

Compare TTS-1 with

GPT-4o Mini TTSOpenAI

Grok Voice TTSxAI

Gemini 3.1 Flash TTS PreviewGoogle AI Studio

Speech 2.8 HDMiniMax

Speech 2.8 TurboMiniMax

Speech 02 HDMiniMax

Frequently Asked Questions

Who created TTS-1?

TTS-1 was created by OpenAI.

How much does TTS-1 cost?

TTS-1 costs $0.02 per 1,000 characters of input text. A short paragraph of roughly 500 characters costs about $0.009.

How fast is TTS-1?

TTS-1 is classified as a "fast" speed model. It is tuned for low-latency synthesis, making it well suited to interactive and real-time use.

What voices and languages does TTS-1 support?

TTS-1 supports 78 curated voices spanning 7 languages, including English, Chinese, Korean, Japanese, Spanish, and Portuguese. Every voice in the catalog can be used with this model.

Does TTS-1 support emotion control?

TTS-1 does not expose explicit emotion control. Delivery follows the natural intonation of the selected voice.

How much text can TTS-1 synthesize at once?

TTS-1 accepts up to 4,096 characters of input text per request. Longer documents are split automatically across multiple requests.

How does TTS-1 compare to other TTS models?

TTS-1 is one of several text-to-speech models available on idapt. Compare it with GPT-4o Mini TTS, Grok Voice TTS, Gemini 3.1 Flash TTS Preview and more on the audio models directory.

Where can I use TTS-1?

You can generate speech with TTS-1 on idapt.app — in chat via the media tools, in hands-free voice mode, or through the public API. No separate API key required: idapt provides TTS-1 alongside 200+ AI models in one professional workspace.

Generate speech with TTS-1

Frequently Asked Questions

Who created TTS-1?

TTS-1 was created by OpenAI.

How much does TTS-1 cost?

TTS-1 costs $0.02 per 1,000 characters of input text. A short paragraph of roughly 500 characters costs about $0.009.

How fast is TTS-1?

TTS-1 is classified as a "fast" speed model. It is tuned for low-latency synthesis, making it well suited to interactive and real-time use.

What voices and languages does TTS-1 support?

TTS-1 supports 78 curated voices spanning 7 languages, including English, Chinese, Korean, Japanese, Spanish, and Portuguese. Every voice in the catalog can be used with this model.

Does TTS-1 support emotion control?

TTS-1 does not expose explicit emotion control. Delivery follows the natural intonation of the selected voice.

How much text can TTS-1 synthesize at once?

TTS-1 accepts up to 4,096 characters of input text per request. Longer documents are split automatically across multiple requests.

How does TTS-1 compare to other TTS models?

TTS-1 is one of several text-to-speech models available on idapt. Compare it with GPT-4o Mini TTS, Grok Voice TTS, Gemini 3.1 Flash TTS Preview and more on the audio models directory.

Where can I use TTS-1?