TTS-1 HD is OpenAI's high-definition text-to-speech model, delivering noticeably richer audio quality compared to the standard TTS-1. It produces speech with greater naturalness, cleaner pronunciation, and reduced audio artifacts, making it the preferred choice when output quality is a priority over raw speed.
The HD variant targets applications where listeners pay close attention to voice quality — such as premium content platforms, professional voiceovers, and consumer-facing products. It uses the same voice and format options as TTS-1 but at higher fidelity, typically at a moderate increase in processing time and cost.
Key Features
Higher audio fidelity than TTS-1 with reduced artifacts
Same six built-in voice options as TTS-1
Supports MP3, Opus, AAC, and FLAC output formats
More natural prosody and intonation on complex sentences
Drop-in replacement for TTS-1 via the same API endpoint
Ideal Use Cases
Premium audiobook and podcast production
Professional voiceover for video content
High-quality accessibility narration
Consumer-facing voice assistants where quality is critical
Brand voice applications requiring consistent, polished audio
Example Prompts for TTS-1 HD
Technical Specifications
| Provider | OpenAI |
| Category | Audio |
| Modality | Text -> Audio |
Frequently Asked Questions
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