Graded A- on resilience. In Vannus's assessment it has not disclosed which model it runs — builds its own AI or is not captured by any single model provider.
Low-latency text-to-speech and speech-to-text API (Sonic model family) built for real-time voice agents. Terms name Cartesia AI, Inc., 555 De Haro Street, Suite 300, San Francisco, CA 94107, governed by California law. The vendor does not claim ownership of inputs or outputs but takes a broad licence to use them for model improvement; users may opt out of training via a request form, effective pro
Not disclosed. Cartesia does not publish which model it runs, so this criterion is excluded and the grade rests on what we could verify. We say so rather than guess.
This is a separate question from the grade above. The grade measures resilience — whether the tool endures and whether you could leave it. This measures who can compel your data. A tool can score modestly on one and strongly on the other, and many do.
The vendor's published or catalog-recorded posture — the concrete facts this grade is built from. A full audit verifies each against the vendor's current documentation.
Vannus grades Cartesia against nine dimensions of trust — data sovereignty, training privacy, compliance posture, operational resilience, exit portability, and more. The heaviest criterion asks whether the tool builds its own AI or resells someone else's model; where the vendor discloses it, the grade cites the vendor's own documentation. No paid placements — scoring is walled off from affiliate revenue. See the methodology →