Onyx vs Glean: Self-Hosted Search or Managed Enterprise AI?

*Research-based editorial guidance, checked October 21, 2026. No independent product benchmark or hands-on performance rating is claimed.*

Which should you shortlist?

Choose Onyx for a deployment-control evaluation, especially when your team wants to operate its own search infrastructure. Choose Glean for a managed enterprise-search evaluation when connector coverage and platform administration fit your organization. Neither choice eliminates permissions testing or content cleanup.

Onyx documents cloud and self-hosted options. Glean describes managed workplace search with source-aware access controls. Those are product descriptions, not proof that either will retrieve your hardest internal answer correctly. Do not use one vendor's competitor page as an independent security assessment.

Self-hosting shifts responsibility

A self-hosted system can give your organization more infrastructure control, but someone must own patching, backups, indexing failures and model connectivity. Ask where embedding, inference, telemetry and support access occur. Hosting the application yourself does not establish that every dependent service runs inside your boundary.

For a managed service, request the contractual data flow, retention schedule, deletion process and connector scope. Compare them with your requirements rather than treating “enterprise” as an answer. A smaller organization with no search operator may prefer managed operations even if source access is available.

Permission correctness comes before answer quality

Create two test identities with different access to the same project. Ask both the same questions, then remove a permission and repeat. Test document titles, snippets, citations and generated answers; leakage can occur before a full document opens. Measure the time from revocation to removal from all answer surfaces.

Also test an old policy that contradicts its replacement. An answer with a valid citation to an obsolete policy still fails the business task. Require a clear owner for stale content and a visible source date where available.

Compare a full year of ownership

Request quotes against the same user count, connectors, document volume, retention, support and model assumptions. Add implementation, identity work, content cleanup, employee onboarding and incident time. Compare annual cost per active successful user, not only a license price.

For example, a lower license bill can lose its advantage when a specialist spends several hours each week repairing connectors. Conversely, an existing infrastructure team may make self-operation reasonable. These are planning scenarios, not measured savings.

Run a bounded pilot

Use the 30-question evaluation pack. Freeze the source set and expected answers before either demo. Include ordinary questions, conflicting policies, missing answers and permission changes. Have reviewers score the source support without seeing which product produced the answer.

A proposed release gate is zero permission leaks, successful recovery from revoked credentials and an agreed answer-support threshold on permitted questions. Set that threshold before testing. Record review minutes and operating time alongside correctness.

Recommendation

Prefer the deployment you can operate responsibly and the retrieval that passes your actual corpus. Read the individual Onyx profile and Glean profile, then use the same pilot for both. A polished demonstration should start your evaluation, not conclude it.