The closest like-for-like: an enterprise AI agent sold through sales on the same autonomous-resolution pitch. Neither publishes a pricing page, so both cost a call to price.
Ada documents a full four-role seat model and publishes no seat price. Sierra publishes no price either but rules seats out entirely, which is the sharpest structural contrast in this category.
Intercom publishes $0.99 per outcome and defines the billable event itself. Sierra publishes no rate and negotiates the definition per contract, so Intercom can be priced before a call and Sierra cannot.
A per-resolution AI layer aimed at the same buyer, but owned by Zendesk, the seat-based incumbent Sierra argues against by name.
7 of 9 not published by Sierra, checked