Copilot vs Glean: Which Enterprise AI Wins in 2026?
Both of these come up in the same enterprise AI shortlist, but they solve different problems. Microsoft Copilot is the AI assistant embedded across Microsoft 365, drawing on Microsoft Graph so it can reason over your Outlook mail, Teams chats, SharePoint files, and Office documents from inside the apps you already use. Glean is an enterprise AI search and knowledge platform that indexes all of your company’s SaaS tools through vendor-neutral connectors, builds a permissions-aware knowledge graph, and answers questions across everything at once. The core distinction: Copilot goes deepest inside the Microsoft stack, while Glean spreads widest across every tool regardless of who makes it. Before you compare feature lists, name the real problem: is your knowledge mostly locked in Microsoft, or scattered across many vendors that no one platform owns?
The One-Sentence Answer
Use Copilot if your organization runs on Microsoft 365 and you want AI inside those apps; use Glean if your knowledge lives across many different vendors and you need one neutral search-and-answer layer over all of them.
Side-by-Side Comparison
| Dimension | Microsoft Copilot | Glean |
|---|---|---|
| What it is | AI assistant embedded across Microsoft 365 | Enterprise AI search + knowledge platform |
| Core job | Draft, summarize, and answer inside Office, Outlook, Teams | Search and answer across all company apps via a knowledge graph |
| Data reach | Deepest in Microsoft Graph (Outlook, Teams, SharePoint, Office) | Vendor-neutral: 100+ connectors across Slack, Drive, Jira, Salesforce, etc. |
| Pricing (2026) | Copilot Business ~$21/user/mo; Enterprise add-on ~$30/user/mo on top of a qualifying M365 plan; Copilot Chat included with eligible M365 | Not public; sales-led, roughly ~$50/user/mo base plus AI add-on, ~100-seat minimum |
| Buying model | Add-on to existing Microsoft licenses; largely self-serve for admins | Enterprise sales cycle, demo, scoping, annual contract |
| Distribution | Rides on existing M365 seats | Standalone platform you deploy and index |
| Best fit | Microsoft-centric organizations | Multi-vendor stacks needing one search layer |
| Governance | Inherits Microsoft 365 / Entra permissions | Permissions-aware indexing across every connected source |
Copilot’s enterprise add-on runs about $30/user/month on top of a qualifying Microsoft 365 plan, while Copilot Business sits near $21 and Copilot Chat is included with eligible M365 subscriptions. Glean does not publish pricing; buyers report a per-seat base near $50/user/month plus an AI add-on and a roughly 100-seat minimum, finalized through a sales process. Confirm current numbers with each vendor before budgeting, since Microsoft’s base license prices and Copilot tiers shifted mid-2026.
When to Use Copilot
- Your company already licenses Microsoft 365 and most work happens in Outlook, Teams, Word, Excel, and PowerPoint.
- You want AI inside the apps — summarize this thread, draft this doc, build this deck — not in a separate search tool.
- You value adding AI as a per-seat toggle on licenses you already own rather than standing up a new platform.
- Your sensitive data mostly lives in SharePoint, OneDrive, and Exchange, where Copilot inherits existing permissions.
Copilot’s advantage is depth and distribution: it is already wired into the Microsoft apps your team lives in, so adoption is a license change, not a rollout.
When to Use Glean
- Your institutional knowledge is spread across many vendors — Slack, Google Drive, Jira, Confluence, Salesforce, Zendesk — with no single owner.
- Employees waste time hunting for the right document, ticket, or decision across a dozen disconnected apps.
- You want one permissions-aware search and answer layer over everything, not an assistant tied to one vendor’s stack.
- You are prepared for an enterprise deployment: connectors to index, permissions to map, and a sales-led contract.
Glean’s advantage is breadth and neutrality: its knowledge graph treats every connected app as a first-class source, so a Microsoft doc and a Slack thread and a Salesforce record all surface in the same answer.
The Question That Actually Decides It
The deciding factor is not which model is smarter — it is where your knowledge actually lives. If your organization is genuinely Microsoft-centric, Copilot’s native depth into Graph is hard to beat and it costs less to adopt because it rides on seats you already own. If your stack is multi-vendor and the answers people need are scattered across tools Microsoft does not make, Glean’s neutral index is the reason it exists; forcing that job onto a Microsoft-first assistant leaves half your knowledge unreachable. A useful gut check: list the ten apps where your team’s real work lives, and see how many carry the Microsoft logo.
One thing worth naming: both Copilot and Glean are built to find answers and draft text — neither one actually sends the reply, books the meeting, or updates the record for you, which is a different job that assistants like Carly are designed to do.
Quick Reference
| Your situation | Pick |
|---|---|
| We run on Microsoft 365 and want AI in those apps | Copilot |
| Our knowledge is scattered across many non-Microsoft tools | Glean |
| We want AI as a cheap add-on to licenses we own | Copilot |
| We need one neutral search layer over everything | Glean |
| We are Microsoft-heavy but have a few key outside apps | Copilot, with connectors where possible |
| We want a vendor-agnostic answer engine across the whole company | Glean |
FAQ
Is Glean better than Copilot? Neither is universally better. Glean wins when your knowledge is spread across many vendors and you need one neutral search layer; Copilot wins when your work lives in Microsoft 365 and you want AI embedded in those apps at a lower per-seat cost.
Can Copilot search across non-Microsoft apps like Glean does? Copilot can reach some external sources through connectors and Graph connectors, but its depth and default reach are strongest inside the Microsoft ecosystem. Glean was purpose-built as a vendor-neutral index across 100+ apps, which is its core differentiator.
Why is Glean’s pricing so hard to find? Glean is sales-led and does not publish standard rates. Buyers report a per-seat base plus an AI add-on with roughly a 100-seat minimum, so the real number comes from a demo and negotiation rather than a public page.
What if I want the work done, not just found or drafted? Both Copilot and Glean stop at surfacing answers and drafting text. If you want an assistant that acts on its own — replies to people, books meetings, and updates your CRM across your connected tools — that is a separate category from enterprise search; Carly is one example, working over Gmail or Outlook.
Related: ChatGPT Work vs Copilot · Microsoft Copilot alternatives · Glean alternatives
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