Microsoft Agent 365Control plane to discover, govern and secure AI agents in Microsoft 365
vs
SierraHelps businesses build better, more human customer experiences with AI.
Comparison · AI Agents · weekly run Nov 3
Microsoft Agent 365 vs Sierra
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Sierra is the stronger AI pick in AI Agents: it has a visibility score of 1.5 versus 0.3 for Microsoft Agent 365.
Choose Microsoft Agent 365 if…
- You prefer a larger, established vendor (5,000+ employees)
Choose Sierra if…
- You want the brand AI engines rank higher (1.5 vs 0.3)
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Microsoft Agent 365 | Sierra |
|---|---|---|
| Visibility score | 0.3% | 1.5% |
| Change vs last week | New | New |
| Rank in AI Agents | #72 | #49 |
| Share of voice | 0.1% | 0.5% |
| Mentions this run | 1 | 3 |
| Positive in AI answers | — | 33% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Microsoft Agent 365 0pp · Sierra 0pp over 0 weekly runs.
Engine by engine
Sierra leads on 3 of 3 engines
ChatGPT
AI Mode
Perplexity
Microsoft Agent 365Sierra
Head to head in AI answers
0 engine answers name both brands
0Microsoft Agent 365 ranked higher
0Sierra ranked higher
Features, pricing & fit
| Dimension | Microsoft Agent 365 | Sierra |
|---|---|---|
| Deployment | Managed through the Microsoft 365 admin center | Managed and forward-deployed, with no self-serve option. |
| Founded | 2025 | 2024 |
| Headquarters | Redmond, Washington | San Francisco, California, United States |
| Employees | 5,000+ | 1,001–5,000 |
| Funding | — | Series E, led by Tiger Global and GV |
| Best for | — | Businesses that want customer service AI agents across chat and voice, built by customer experience teams with or without engineering support. |
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Microsoft Agent 365 vs Sierra”, https://slateindex.ai/compare/microsoft-agent-365-vs-sierra, data of Nov 3, 2026. Licence: CC BY 4.0.