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Customer Experience AI Agent agents
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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.

Overall scoreFive points for every passed standard task. Missing or failed tasks earn zero.

Not evaluated

G2 task evaluationScores based on G2's standardized task evaluation, separate from buyer reviews.
AccuracyNot available
Policy complianceNot available
G2 buyer reviewsAggregate scores reported by verified G2 reviewers. These do not affect the task-based Overall 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.

Supported

Multilingual Support

Supported

Case Routing & Escalation

Supported

Grounded Answers

Supported

Policy Compliance

Partial support

Refunds & Billing

Performance claims

Vendor-reported

Frontier skills

Emerging capabilities selected for this evaluation category.

Documented capability

Live-call payments end to end (card + ACH, request to confirmation in one call)