Head to head
Cartesia vs OpenAI TTS
As a text-to-speech API, OpenAI TTS rates higher on the APIbenchmarks Index, 82.6 to 75.7, a 6.9-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Cartesia | OpenAI TTS |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 75.7 | 82.6 |
Specifications
| Cartesia | OpenAI TTS | |
|---|---|---|
| Best for | Real-time TTS for voice agents | TTS bundled into the OpenAI API |
| Free tier | 20k credits (~15-20 min audio) | No |
| Pricing | Per character (credits) | Per 1M characters / tokens |
| Official SDKs | 4 languages | 5 languages |
Is Cartesia better than OpenAI TTS?
On the APIbenchmarks Index, OpenAI TTS rates higher (82.6 vs 75.7). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.