Key strengths
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Sierra — Developer & Integration Documentation
Channels & Integrations
Sierra supports multichannel deployment out of the box, with verified integrations including:
- SMS
- ChatGPT
Additional supported surfaces include chat, email, and voice.
Agent Builder: Ghostwriter
Ghostwriter is Sierra's AI agent configuration tool. It is designed to require no engineering support, enabling product, CX, or operations teams to build and iterate on agents independently.
Horizon (Long-Horizon Planning)
Horizon powers multi-turn, extended conversation reasoning and proactive engagement — allowing agents to follow up with users, manage complex workflows across time, and initiate interactions rather than only responding reactively.
Insights Explorer (Observability & Experimentation)
- Run multivariate conversation experiments to test agent variants.
- Monitor agent performance and conversation outcomes through built-in observability tooling.
- Designed for teams that need data-driven iteration on agent behavior at scale.
Pricing Model
Sierra uses outcome-based pricing — costs are tied to the value delivered, not to API calls, seats, or message volume.