# How Microsoft Copilot Search Works: The Architecture Deepdive

> A technical breakdown of how Microsoft Copilot processes your query through the Prometheus model, Bing grounding, 5-stage orchestration pipeline, RAG system, and Copilot Checkout shopping pipeline.

**Published:** 2026-03-21  
**Category:** Technical  
**URL:** https://www.tryrankly.com/blogs/how-microsoft-copilot-search-works  

## In this article

1. Overview
2. The Three Pillars
3. Prometheus Model
4. Query Processing
5. Orchestration Pipeline
6. Grounding
7. RAG Pipeline
8. Semantic Index
9. Consumer vs Enterprise
10. Shopping
11. Citations
12. Responsible AI
13. What This Means
14. Sources

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Read the full article with all source citations and analysis at [https://www.tryrankly.com/blogs/how-microsoft-copilot-search-works](https://www.tryrankly.com/blogs/how-microsoft-copilot-search-works).

**Keywords:** Microsoft Copilot, Copilot Search, Prometheus model, Bing grounding, Microsoft Graph, semantic index, RAG, enterprise AI search, orchestration pipeline