As of August 2026, calling Microsoft 365 Copilot programmatically means choosing between two distinct implementations — the Work IQ Chat API (general availability, one permission, Copilot Credits billing) and the Graph beta Chat API (preview, seven required delegated scopes, flat M365 Copilot license) — and that choice shapes your authentication architecture, your enterprise admin consent conversation, and your billing model before you write a line of code. This post covers the complete request and response shape for both paths, the permission and billing models that cannot be swapped at go-live, and the five things neither implementation can do regardless of which path you choose.
Microsoft Graph & Work Signals
The Microsoft 365 Copilot Retrieval API: What Every Developer Must Know Before Building a RAG Integration
The Microsoft 365 Copilot Retrieval API gives developers a direct path to retrieval-augmented generation on organizational content — no chunking pipeline, no vector store, no sync job — by exposing the semantic index Microsoft 365 already maintains for Copilot across SharePoint, OneDrive, and connector content. This post covers the complete request and response shape, the delegated-only auth constraint that rules out daemon integrations, the 200-request-per-user-per-hour rate limit strategy, and a clear decision boundary between the Retrieval API and the beta Search API.
Microsoft 365 Copilot Usage Reports API: Programmatic Access to Tenant Adoption Data
The Microsoft 365 Copilot Usage Reports API gives IT admins programmatic access to the adoption data that is currently a manual click-through in the admin center. This post covers the three GA Graph endpoints, the single permission required, what the API deliberately withholds — including per-user prompt counts — and how to connect it to a reporting pipeline.
🧠 Inside Work IQ: How Microsoft Built the Intelligence Layer for Copilot
Work IQ is the intelligence layer behind Microsoft 365 Copilot that enables AI to understand work signals, memory, and organizational context. In this post, we break down the Work IQ architecture and explain why it changes how enterprise AI and agents are built. #WorkIQ #MicrosoftCopilot #Microsoft365 #MicrosoftIgnite #M365MVP #EnterpriseAI #CopilotArchitecture #MicrosoftGraph #WorkSignals #ModernWork