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Customer Experience AI Agent agents
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Sierra

4.5(45 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 scoreTasks passed divided by all 46 assigned evaluation tasks. Missing or failed executions remain in the denominator.

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 use88
Quality of support91

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

Product-specific work documented in reviewed product sources.

Voice Call Resolution Replacing IVR

Autonomous Email Resolution with CRM Context

Proactive Outbound Engagement & Churn Prevention

Performance claims

Vendor-reported

Resolution rate 80%

Product strategyOperating and delivery choices explicitly documented in reviewed product sources.

Forward-deployed engineering
yes
Self-serve
no
Agent-callable
yes