Listed under sierra.ai/product/ alongside the platform record; Sierra markets it as part of its agent platform, not as a separate purchase. No separate rate is published.

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Official documentation · 6 Sep 2026

Fetched 2026-09-06: HTTP 200, <title> 'Horizon | Sierra', <h1> 'Horizon'.

Also from Sierra

Sierra AI agent

Platform for building and running customer-facing agents that handle support conversations over chat and voice.
Agent Studio Application

Empower customer experience teams to build and manage agents—without writing a line of code. Set up customer journeys, configure knowledge, and define brand guidelines effortlessly.
Explorer Application

Ask any question in natural language, and Explorer will use analytics and sample customer conversations to provide answers and actionable recommendations.
Ghostwriter Application

Build or modify your agent simply by describing how you want your agent to behave. Prompt workflows, systems integrations, guardrails, tone, and style.
Channels Application

Create consistent experiences across voice, chat, email, and more in 58 languages, available 24/7/365.
Insights Application

Measure what matters, test what works, and understand every agent decision with analytics, experimentation, and observability built for continuous improvement.
Context Engine Developer tool

Supplies persistent customer context and behavioral signals to Sierra's conversational agents.

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Horizon

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