OpenAI TTS-1 HD
Available openai/tts-1-hd · by OpenAI · neural-tts
Pricing — 1 offering(s)
OpenAI (Audio)
Text characters
- $30.00 / 1M characters Current 2023-11-06 → present
Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.
Capability profile
voice naturalness strong
language support strong
voice variety weak
streaming latency moderate
cloning support weak
Benchmarks
| Benchmark | Score | Config | Source |
|---|---|---|---|
| MOS (naturalness) | — | No independently published MOS. Vendor-described as higher fidelity than TTS-1; community rates it between TTS-1 and ElevenLabs Multilingual v2. | — |
Operator guidance
Choose TTS-1 HD when output quality is more important than cost — the 2× price premium is justified for final production audio. For real-time apps and volume workloads, TTS-1 is sufficient. ElevenLabs Multilingual v2 exceeds TTS-1 HD in naturalness but costs 4× more.
Use cases
- Final narration and voice-over content where quality is paramount
- Podcast production and audio content where TTS-1 quality isn't sufficient
- Accessible content with premium audio requirements
Limitations
- Only 6 preset voices — same constraint as TTS-1
- No voice cloning or SSML support
- 2× cost of TTS-1; may be overkill for many use cases