Graded NR on resilience. In Vannus's assessment it has not disclosed which model it runs — .
Enterprise AI agent platform for customer-facing voice and chat. Agents are built and versioned in Agent Studio with Ghostwriter, deployed across Channels, and monitored with Insights and Explorer. Sold to large consumer brands for support, commerce and account servicing. The privacy policy names 'Sierra Technologies, Inc. 150 Sutter St. #690 San Francisco, CA 94104'.
Not disclosed. Sierra 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 Sierra 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 →