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 Copilot Studio
Sierra (Sierra) and Copilot Studio (Microsoft) both sit in Agents & Automation. Copilot Studio shipped more tracked changes in the last 30 days (9 vs 1). Every value below comes from the latest crawl of the vendors' own pages.
| Attribute | Sierra Sierra | Copilot Studio Microsoft |
|---|---|---|
| Segment | Agents & Automation | Agents & Automation |
| Version | Agent OS 2.0 | GPT-5 in Copilot Studio |
| Entry cost | Pricing is not published (outcomes-based model: pay for results, not tokens). Contact sales. | from $30/mo |
| Pricing tiers | Outcome pricing free | Microsoft 365 Copilot $30 · Microsoft Copilot Studio Pre-purchase plan free · Microsoft Copilot Studio Pay-as-you-go free |
| Model stack | Claude · GPT-5 class · Sierra Agent OS 2.0 | Anthropic lineup · Anthropic model lineup · Anthropic models · Anthropic multi-model · Anthropic multi-model lineup · GPT-5 |
| Context window | Model-dependent | — |
| Public API | ||
| Routes models | ||
| Changes / 30d | 1 | 9 |
| 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 | Low-code agents, Graph grounding, Autonomous triggers, Multi-agent orchestration, AI agents, conversational flow, autonomous agents, pre-built agents |
Copilot Studio
Low-code builder for autonomous agents grounded in Microsoft Graph and Dataverse.
Full Copilot Studio record →