Alloy and Onyx serve completely different purposes. Alloy's neutrality makes it the workhorse for everyday applications where attention should focus on content. Onyx's bold presence is designed for moments when you need to capture and hold attention. Choose based on whether your content should blend in or make an impact.
All samples use the high-quality tts-1-hd model at 1x speed.
| Characteristic | Alloy | Onyx |
|---|---|---|
| Style | Neutral | Bold |
| Description | Balanced default voice. Works across most use cases without drawing attention. | Strong presence. Good for announcements and high-impact messaging. |
| Best Use Cases |
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Alloy stays neutral. Onyx commands attention with its bold presence.
The best way to make your decision is to test both voices with your actual content. Listen to the audio samples above with headphones, and consider generating test clips with your own scripts. Small differences in delivery can have significant impacts on user experience, so investing time in testing upfront will pay dividends.