TTS-1 HD (Nov 2023)
TTS-1 HD (Nov 2023) is the November 2023 snapshot of OpenAI's high-definition text-to-speech model, a higher-fidelity sibling to TTS-1. Where TTS-1 prioritizes low latency, TTS-1 HD prioritizes audio quality — it produces richer, more natural-sounding speech with fewer artifacts, at the cost of slightly higher latency and price per character.
This model is the right choice when output audio quality is a primary concern: professional narrations, premium voice products, published audio content, or brand experiences where synthetic speech artifacts would be noticeable. The same six voices available in TTS-1 are offered here, but rendered at higher fidelity.
Key Features
High-definition audio output with improved naturalness over standard TTS-1
Six available voices, each rendered at higher fidelity than the standard tier
Supports multiple languages with natural prosody and intonation
Pinned November 2023 snapshot for consistent voice characteristics
Suitable for long-form narration of articles, books, and documentation
Better handling of punctuation-driven pacing and expressive speech
Ideal Use Cases
Professional narration of articles, educational content, and documentation
Premium voice products where audio quality directly affects user experience
Brand voice applications requiring polished, artifact-free speech
Audiobook generation and long-form content-to-audio pipelines
Example Prompts for TTS-1 HD (Nov 2023)
Technical Specifications
| Provider | OpenAI |
| Category | Audio |
| Modality | Text -> Audio |
Frequently Asked Questions
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