Activefastaudio Proprietary

TTS-1-hd

by OpenAI· Released November 2023

TTS-1-hd is OpenAI's high-definition text-to-speech model, offering superior audio quality with more natural intonation and clarity compared to the standard TTS-1 model. It supports multiple voices and languages, making it ideal for applications requiring lifelike speech synthesis.

Official Site API Docs

Input cost

$100.00 per 1M characters

Output cost

—

Context window

—

Max output

—

Modalities

audio

License

proprietary

Capabilities

Text-to-SpeechMultiple VoicesMultiple LanguagesStreamingHigh-Definition Audio

Best For

Generating high-quality, natural-sounding speech from text for applications like audiobooks, voiceovers, and accessibility tools.

Strengths

Superior audio quality with natural intonation
Supports multiple voices and languages
Low latency for real-time applications
Cost-effective for high-volume usage

Limitations

No fine-tuning available
Limited to speech generation (no music or sound effects)
Character-based pricing can be expensive for long texts
Not suitable for real-time conversational AI due to latency

Use Cases

Audiobook narration

Voiceovers for videos and presentations

Accessibility tools for visually impaired users

Language learning applications

Interactive voice response systems

Content creation for podcasts

Assistive communication devices

Improvements Over Previous Model

Higher audio quality with more natural prosody and clarity compared to TTS-1
Improved voice consistency and reduced artifacts
Better handling of complex sentences and punctuation
Enhanced multilingual support with more accurate pronunciation

Back to all models