Sierra
Sierra builds branded voice and chat agents for support, charging per resolved conversation rather than per seat.
Full Sierra record →Head to head
Sierra vs LangGraph
Sierra (Sierra) and LangGraph (LangChain) both sit in Agents & Automation. LangGraph shipped more tracked changes in the last 30 days (4 vs 1). Every value below comes from the latest crawl of the vendors' own pages.
| Attribute | Sierra Sierra | LangGraph LangChain |
|---|---|---|
| Segment | Agents & Automation | Agents & Automation |
| Version | Agent OS 2.0 | LangGraph |
| Entry cost | Pricing is not published (outcomes-based model: pay for results, not tokens). Contact sales. | LangGraph is an MIT-licensed open-source library and is free to use. |
| Pricing tiers | Outcome pricing free | Open Source / MIT-licensed free |
| Model stack | Claude · GPT-5 class · Sierra Agent OS 2.0 | any model provider · Model-agnostic |
| Context window | Model-dependent | — |
| Public API | ||
| Routes models | ||
| Changes / 30d | 1 | 4 |
| Origin | Global | United States |
| Capabilities | Voice and chat agents, Agent OS, Brand persona control, Supervisor tooling, Outcome analytics, Horizon (Long-horizon agents), Ghostwriter (Agent-building agent), Agent Studio 2.0 | Durable execution, Human-in-the-loop, Checkpointing, Managed deployment, Agent Orchestration, Stateful multi-actor applications, Human-in-the-loop controls, Built-in memory |
LangGraph
Graph-based framework and managed platform for long-running, durable agents.
Full LangGraph record →