AI phone agents for customer service calls
Sierra Voice brings conversational AI to phone support, with agents that can talk naturally, handle interruptions, and act inside your internal systems. It’s built for customer experience teams that want to replace or augment traditional call flows with a more adaptive voice agent.
Agenticness = how independently a tool can take action, scored across 9 dimensions. Scored independently by David Kooi, Skylark Creations — see full rubric → Last re-evaluated 31 July 2026.
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What's happened with Sierra AI lately
- Score changeRubric upgrade v3_0 → v3.1: score 13/32 → 16/3613 → 16/36(+3)
Rubric upgrade: agenticness v3.0 (8 dims, /32) → v3.1 (9 dims, /36). Adds Dim 9 (Operator Sovereignty), splits Dim 6 into 6a/6b lenses, tightens Dim 4 autonomous-retry distinction. Not a product change — score shift reflects new dimension + recalibrated rubric, not a change in the tool. Fanout suppressed.
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News mentions sourced from our news feed; score changes from periodic re-evaluations.
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About
Sierra Voice is an enterprise customer support product for handling phone calls with AI agents. According to Sierra, it’s built to deliver natural, personalized conversations over the phone while fitting into existing call center and support workflows.
Sierra positions the product as a governed, enterprise-ready voice agent platform rather than a general chatbot. The documentation emphasizes security, compliance, deterministic system access, and supervisory layers around LLMs to reduce...
Proposes and executes multi-step plans with your approval.
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Pricing not publicly available
When Sierra AI changes its pricing, we catch it the next morning
We recrawl every tool in this directory daily. AI Insider is the 3-minute brief on what actually changed — pricing, features, score moves on our 36-point rubric — often before any press coverage. Sent daily. Skipped when nothing happened.