Question 1

How is the quality score measured?

Accepted Answer

It comes from Artificial Analysis, an independent benchmark. Listeners hear two clips of the same line without being told which model produced either, and pick the one they prefer. Sonic 3.6 rates above Soniox TTS Real-Time v2, Soniox's current text to speech model.

Question 2

How fast does Cartesia generate speech compared with Soniox?

Accepted Answer

Artificial Analysis measures Sonic 3.6 at 114.9 characters per second and Soniox TTS Real-Time v2 at 18.0, timed by the same harness. That headroom over playback keeps a long turn from stalling mid-sentence.

Question 3

Can I use Cartesia for speech while keeping another transcription provider?

Accepted Answer

Yes. Sonic is a standalone speech API, so it drops into the major voice agent platforms beside whichever transcription and language model you already run.

Question 4

How long does it take to switch from Soniox?

Accepted Answer

One to two weeks for most teams. Cartesia is integrated into the major voice agent platforms and every model is on the public API, so there is no platform to move onto and nothing to unpick later.

Listeners rate Cartesia's Sonic 3.6 above Soniox text to speech.

Listeners rate Sonic 3.6 above Soniox TTS

Sonic 3.6 generates speech six times as fast as Soniox TTS

Reasons why companies choose Cartesia over Soniox

Human-like naturalness

Speed

Frequently asked questions

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