Customer Experience AI Agent agents
Supported Supported Supported Supported Partial support
Sierra
4.4(132 G2 reviews)San Francisco, USAFounded 2023
Enterprise platform to build AI agents that resolve customer service across chat, email, SMS, WhatsApp, voice and ChatGPT, with agent-building tools, analytics and outcome-based pricing.
Task success scoreEach passed standard task earns five points. Scores average comparable runs; failed or missing tasks earn zero. Response quality is scored separately. Displayed scores are rounded.
Not evaluated
Response qualityAccuracy and policy compliance describe response quality separately from the task success score and buyer reviews.
AccuracyNot available
Policy complianceNot available
G2 buyer reviewsAggregate scores reported by verified G2 reviewers. These do not affect the task success score.
Ease of use87
Quality of support90
Estimated autonomyA sourced estimate of how independently the agent can plan and complete work on the L1–L5 scale.
Where this agent sits on the L1–L5 autonomy scale.
L3-L4
L1L2L3L4L5
Skills
The five shared skills reviewed for products in this category.
Case Routing & Escalation
Grounded Answers
Policy Compliance
Refunds & Billing
Performance claims
Vendor-reportedHigher conversion rates (Rocket Mortgage)
4x
View sourceTime to live (Singtel)
<10 weeks
View sourceResolution rate (Airtable)
80%
View sourceFrontier skills
Emerging capabilities selected for this evaluation category.
Documented capability
Live-call payments end to end (card + ACH, request to confirmation in one call)