The governed knowledge ops stack

Two of the four tools, Glean and Guru, are quote-based enterprise platforms with no list price; Microsoft Copilot and Claude have published tiers. The 03 COSTS table above breaks down what each vendor publishes. Whichever way the mix falls, budget the procurement cycles as much as the spend: the knowledge layers price on how much of the estate you index and connect, not on headcount. Price the rollout, not just the licences.

Rarely all at once. This is an estate stack: adopt each layer where the platform already lives. Microsoft 365 Copilot usually lands first, an add-on to a tenant already under governance sign-off. Glean follows when knowledge sprawls beyond what the tenant can see. Guru comes third, because a verified canon needs owners and process, and Claude arrives with the synthesis workloads.

Then you have the communication layer: drafting, summarising and meeting recall inside the tools your organisation already reads. This stack adds what Copilot does not reach. Glean brings permission-aware search across every system, not just Microsoft's. Guru adds curated, owner-verified answers for policy and process. Claude carries the synthesis that needs long-document depth. Keep Copilot as the surface; add reach and rigour behind it.

Glean and Microsoft Copilot answer the same question, from company knowledge, which is the real overlap. The dividing rule is reach. Copilot wins inside the Microsoft estate, grounded in tenant content under existing permissions, and it is already there. Glean wins when knowledge lives across many systems beyond Microsoft, where its permission-aware index reaches what Copilot cannot. Most large estates run both, deliberately. The Glean and Microsoft Copilot comparison, linked above, shows where the line sits.

Often, and this tier says so plainly. Enterprise search and a curated knowledge base only repay their procurement and rollout overhead at real organisational scale, where knowledge genuinely sprawls across many systems. Below that, lighter routes carry most of the value: a well-organised drive, an assistant with document upload, or workspace AI. A team reaching for this to fix disorganisation rather than scale wants the competitive tier, the evidence-grade research stack, without the contracts.

The strictest member sets the floor. Glean and Guru are permission-aware by design: they surface nothing a person could not already open, so audit that indexing before rollout. Microsoft Copilot works tenant content under existing permissions with enterprise data protection, Guru carries SOC 2 Type II and HIPAA posture, and Claude excludes training on team and enterprise tiers. Confirm no-training terms, index scoping and admin controls on every layer before confidential material goes in, and test with a restricted document first.