A different architecture, not a better index

Capability	Mithrandir	Unblocked	Glean	Microsoft Copilot
Knows what each thing is (an ontology, not a text index)	118 types of thing: a decision, a customer, a contract, a line of code, each carrying who may see it	No. Text chunks over engineering sources	No. Document search over people and files	No. Text index over M365 content
Covers the whole company	Sales, legal, finance, people and engineering in one memory, one seat price	Engineering only	Search across the company. Finds documents, keeps no decision and no reason.	Yes, inside Microsoft 365
Keeps the reason behind a decision	Core function: the sentence that caused a result, one step from the result, permanent	Partial: surfaces the discussion, no permanent decision record	No. Indexes live sources; deleted is gone	No. Bound to M365 retention
Access control model	Structural: restricted material is never assembled into the model's context	Mirrors source permissions at retrieval	Mirrors source permissions at retrieval	Permission-trimmed retrieval

Capability	Mithrandir	Unblocked	Glean	Microsoft Copilot
Understands code as structure	Every function, class and dependency kept as itself through refactors and renames	Partial: code linked to threads, not a structural model	No	In the IDE only, no org-wide model
Answer when something is restricted	Complete for that person's clearance, no gap, no leak, by design	Blocked material disappears from the answer with no sign it existed	Answers thin out silently when a source is out of reach	Trimmed at retrieval; the gap is invisible to the asker
Works inside the agent you already use	MCP server: Claude Code, Cursor, Codex, Copilot, ChatGPT, Gemini and the rest	IDE extensions and Slack bot	Its own assistant, connectors emerging	Microsoft's own surfaces
Runs inside your own cloud, with local models	Self-hosted by default; fully local mode for labs that cannot send data out	No. Vendor-hosted SaaS	No. Vendor-hosted	No. Microsoft-hosted

Knows what each thing is (an ontology, not a text index)

118 types of thing: a decision, a customer, a contract, a line of code, each carrying who may see it

Unblocked: No. Text chunks over engineering sources
Glean: No. Document search over people and files
Microsoft Copilot: No. Text index over M365 content

Covers the whole company

Sales, legal, finance, people and engineering in one memory, one seat price

Unblocked: Engineering only
Glean: Search across the company. Finds documents, keeps no decision and no reason.
Microsoft Copilot: Yes, inside Microsoft 365

Keeps the reason behind a decision

Core function: the sentence that caused a result, one step from the result, permanent

Unblocked: Partial: surfaces the discussion, no permanent decision record
Glean: No. Indexes live sources; deleted is gone
Microsoft Copilot: No. Bound to M365 retention

Access control model

Structural: restricted material is never assembled into the model's context

Unblocked: Mirrors source permissions at retrieval
Glean: Mirrors source permissions at retrieval
Microsoft Copilot: Permission-trimmed retrieval

Understands code as structure

Every function, class and dependency kept as itself through refactors and renames

Unblocked: Partial: code linked to threads, not a structural model
Glean: No
Microsoft Copilot: In the IDE only, no org-wide model

Answer when something is restricted

Complete for that person's clearance, no gap, no leak, by design

Unblocked: Blocked material disappears from the answer with no sign it existed
Glean: Answers thin out silently when a source is out of reach
Microsoft Copilot: Trimmed at retrieval; the gap is invisible to the asker

Works inside the agent you already use

MCP server: Claude Code, Cursor, Codex, Copilot, ChatGPT, Gemini and the rest

Unblocked: IDE extensions and Slack bot
Glean: Its own assistant, connectors emerging
Microsoft Copilot: Microsoft's own surfaces

Runs inside your own cloud, with local models

Self-hosted by default; fully local mode for labs that cannot send data out

Unblocked: No. Vendor-hosted SaaS
Glean: No. Vendor-hosted
Microsoft Copilot: No. Microsoft-hosted

Based on each product's public material as of September 2026. This table is about design choices, not marketing. Tell us where we are wrong and we will correct it.

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