Best self-hosted auth platform
4 models · updated 2026-07-16
The verdict
Keycloak leads — 2 of 4 models rank Keycloak the top pick.
Not unanimous: Gemini picks ZITADEL; Grok picks Authentik.
As of 2026-07-16, ChatGPT, Claude, Gemini, Grok collectively rank Keycloak first for self-hosted auth platform on modelsagree.com.
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Combined ranking
- 1GPT #1Claude #1Gemini #2Grok #3
Best overall balance of mature OIDC/SAML, identity brokering, LDAP/AD federation, fine-grained authorization, organizations, passkeys, extensibility, and zero license cost; especially strong when standards coverage and long-term operability matter
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GPT Best overall balance of mature OIDC/SAML, identity brokering, LDAP/AD federation, fine-grained authorization, organizations, passkeys, extensibility, and zero license cost; especially strong when standards coverage and long-term operability matter
Claude The most complete self-hosted IdP by a wide margin — OIDC/OAuth2/SAML, user federation (LDAP/AD), fine-grained authorization, identity brokering, and passkeys, all battle-tested at enterprise scale with CNCF backing and Red Hat's commercial build (RHBK) behind it; the Quarkus rewrite fixed most of the old resource-hunger complaints. Assumption: the typical practitioner wants one server that can handle whatever auth requirement shows up next year, which rewards breadth and maturity over elegance.
Gemini The battle-tested industry standard with unmatched protocol support (OIDC, SAML, OAuth 2.0), comprehensive enterprise directory federation (LDAP, Active Directory), and a massive ecosystem of extensions.
Grok Battle-tested (Red Hat-backed), broadest enterprise protocol/federation support (incl. LDAP/AD/SAML/Kerberos), full-featured realms/authorization, proven at scale for complex orgs.
Where it falls shortper GPT Operationally heavy and comparatively awkward to customize into a polished, product-native SaaS experience
per Claude Operationally heavy and admin-UX-dense — themes, SPIs, and realm config have a steep learning curve, and it's overkill for a single small app that just needs login.
per Gemini High operational overhead due to its heavy JVM/Quarkus footprint and complex upgrade paths that require dedicated DevOps support.
- 2GPT —Claude #3Gemini #3Grok #1
Excellent modern UI/admin experience, broad protocol support (OIDC/OAuth2/SAML/LDAP/SCIM), proxy/forward-auth mode for easy self-hosted app integration, flexible flows, strong for homelabs/SMB/internal tools + SaaS, active community and polished self-hosting (Docker/K8s).
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Grok Excellent modern UI/admin experience, broad protocol support (OIDC/OAuth2/SAML/LDAP/SCIM), proxy/forward-auth mode for easy self-hosted app integration, flexible flows, strong for homelabs/SMB/internal tools + SaaS, active community and polished self-hosting (Docker/K8s).
Claude The best experience for teams that want a self-hosted IdP that's pleasant to run — polished admin UI, visual flow designer for custom auth journeys, built-in outpost proxy for protecting legacy/non-OIDC apps, and broad protocol coverage (OIDC, SAML, LDAP, RADIUS, SCIM); it has become the default for homelab-to-mid-size-company deployments.
Gemini Offers a highly flexible, visual flow-based policy editor for designing complex auth pipelines (MFA, step-up auth, account linking) combined with strong support for forward proxying and LDAP/SCIM out of the box.
Where it falls shortper Claude Python/Django stack scales less predictably at high volume, and its enterprise-gated features plus smaller security-research track record make conservative enterprises pick Keycloak instead.
per Gemini Relies on a resource-heavy stack (PostgreSQL, Redis, Celery) that is over-engineered for simple apps, and its GitOps configuration is less mature than its UI.
- 3GPT #2Claude —Gemini #1Grok —
Narrowly beats Keycloak for SaaS apps due to its first-class multi-tenant organization isolation, modern Go codebase, and event-sourced audit logging, making it much easier to deploy and scale for client-facing applications.
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Gemini Narrowly beats Keycloak for SaaS apps due to its first-class multi-tenant organization isolation, modern Go codebase, and event-sourced audit logging, making it much easier to deploy and scale for client-facing applications.
GPT Near-tie with Keycloak for SaaS; excellent organization-native multitenancy, delegated administration, passkeys, service accounts, strong APIs, and modern self-service flows make it the cleaner default for greenfield B2B products
Where it falls shortper GPT Its event-driven architecture and self-hosted operations are more complex than simpler PostgreSQL-backed alternatives
per Gemini Not built for legacy enterprise setups needing deep Active Directory forest synchronization or complex visual policy flow editors.
- 4GPT —Claude #2Gemini —Grok #2
The strongest modern challenger — Go-based single binary, first-class multi-tenancy (organizations/projects) that SaaS builders actually need, event-sourced audit trail, good passkey and OIDC/SAML support, and a clean API-first design with a permissive-enough license and managed-cloud escape hatch. Near-tie with Authentik; Zitadel wins for SaaS/B2B multi-tenant use cases specifically.
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Claude The strongest modern challenger — Go-based single binary, first-class multi-tenancy (organizations/projects) that SaaS builders actually need, event-sourced audit trail, good passkey and OIDC/SAML support, and a clean API-first design with a permissive-enough license and managed-cloud escape hatch. Near-tie with Authentik; Zitadel wins for SaaS/B2B multi-tenant use cases specifically.
Grok Cloud-native Go-based, excellent multi-tenancy/organizations for B2B SaaS, API-first/developer-friendly, strong audit/event sourcing, passkeys/MFA, efficient self-hosting (low overhead, K8s-friendly), modern alternative to legacy systems.
Where it falls shortper Claude Smaller ecosystem and community than Keycloak, and its opinionated event-sourced architecture plus login-UI customization model can fight you when you need deep bespoke flows.
- 5GPT #5Claude #4Gemini —Grok #5
The best headless, API-first option — you own the entire login UI, components compose cleanly (Kratos for identity, Hydra for OAuth2/OIDC, Keto for permissions), it's genuinely cloud-native, and Hydra's OpenID certification is rock solid. Earns its spot for engineering teams building auth as a product surface rather than adopting a boxed IdP.
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Claude The best headless, API-first option — you own the entire login UI, components compose cleanly (Kratos for identity, Hydra for OAuth2/OIDC, Keto for permissions), it's genuinely cloud-native, and Hydra's OpenID certification is rock solid. Earns its spot for engineering teams building auth as a product surface rather than adopting a boxed IdP.
GPT Strong headless, API-first identity components with excellent protocol foundations and unusually flexible control over registration, login, sessions, consent, and UI; ideal for teams building identity deeply into their product
Grok Highly modular/cloud-native, flexible for custom auth/authorization (Zanzibar permissions), strong for developers building tailored SaaS flows, open protocols.
Where it falls shortper GPT The composable architecture shifts substantial integration, UI, policy, and operational work onto the application team
per Claude You assemble it yourself — no batteries-included admin console or ready UI, multiple services to operate, and the open-source vs. Ory Network feature split requires reading the fine print; wrong choice for teams that want auth done this week.
- 6GPT #3Claude #5Gemini —Grok —
Polished developer experience, straightforward deployment, strong tenant support, customizable hosted pages, passkeys, enterprise federation, and useful migration tooling; ranks highly for teams willing to buy advanced capabilities
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GPT Polished developer experience, straightforward deployment, strong tenant support, customizable hosted pages, passkeys, enterprise federation, and useful migration tooling; ranks highly for teams willing to buy advanced capabilities
Claude The strongest downloadable commercial option — free unlimited-user community edition you self-host, excellent developer docs, clean tenanting, every OAuth/OIDC grant done correctly, and paid tiers add advanced MFA and threat detection with real vendor support behind it; a pragmatic pick for teams that want Keycloak-class capability with a company on the hook.
Where it falls shortper GPT Important enterprise features and support require paid editions, weakening its value for fully open-source deployments
per Claude Not open source (source-available/proprietary core), so the best features sit behind license fees and you're exposed to vendor pricing changes in a way Keycloak/Authentik users aren't.
- 7GPT —Claude —Gemini —Grok #4
Lightweight, secure forward-auth focused for reverse-proxy protected self-hosted apps, low resource footprint, solid 2FA/ACLs, simple config for typical practitioner protecting internal tools.
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Grok Lightweight, secure forward-auth focused for reverse-proxy protected self-hosted apps, low resource footprint, solid 2FA/ACLs, simple config for typical practitioner protecting internal tools.
- 8GPT #4Claude —Gemini —Grok —
Excellent self-hosted SSO and identity gateway with OIDC, SAML, LDAP, SCIM, proxy authentication, flexible visual flows, and a notably approachable admin experience
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GPT Excellent self-hosted SSO and identity gateway with OIDC, SAML, LDAP, SCIM, proxy authentication, flexible visual flows, and a notably approachable admin experience
Where it falls shortper GPT Better suited to securing organizations and existing applications than serving as deeply embedded, high-scale customer identity infrastructure for a SaaS product
- 9GPT —Claude —Gemini #4Grok —
Offers the absolute best developer experience (DX) and polished, out-of-the-box consumer-grade interfaces, functioning as a direct, self-hosted open-source drop-in replacement for Clerk or Auth0.
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Gemini Offers the absolute best developer experience (DX) and polished, out-of-the-box consumer-grade interfaces, functioning as a direct, self-hosted open-source drop-in replacement for Clerk or Auth0.
Where it falls shortper Gemini Lacks advanced enterprise features like complex B2B multi-tenant federation and native LDAP directory synchronization found in Zitadel or Keycloak.
- 10GPT —Claude —Gemini #5Grok —
Uses a unique SDK-first, app-embedded architecture that integrates directly into frontend and backend APIs, giving developers complete control over UI and auth flows without redirecting users to a separate portal.
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Gemini Uses a unique SDK-first, app-embedded architecture that integrates directly into frontend and backend APIs, giving developers complete control over UI and auth flows without redirecting users to a separate portal.
Where it falls shortper Gemini Lacks a centralized visual admin/management dashboard out of the box and is not designed to serve as a standalone identity provider (IdP) for SSO.
Just missed the top 5
GPT SuperTokens — excellent application-native sessions and customizable login SDKs, but paid multitenancy and narrower federation breadth reduce self-hosted value · Casdoor — broad protocols and integrations at low cost, but documentation, polish, and operational confidence trail the top five
Claude SuperTokens — great embeddable OSS auth for a single app with prebuilt UI components, but it's an auth library/service for your app more than a full standalone IdP — weaker SAML/federation story
Gemini Ory Kratos — requires orchestrating separate components like Hydra and Keto and building a custom UI, creating high operational complexity for typical SaaS teams · Authelia — designed primarily as a lightweight reverse-proxy gateway for homelabs rather than a full customer identity provider for web apps
Grok FusionAuth — strong self-hostable with good features but core not fully open-source, commercial lean
By model
ChatGPT
- 1.Keycloak
- 2.ZITADEL
- 3.FusionAuth
- 4.authentik
- 5.Ory
Claude
- 1.Keycloak
- 2.Zitadel
- 3.Authentik
- 4.Ory
- 5.FusionAuth
Gemini
- 1.ZITADEL
- 2.Keycloak
- 3.Authentik
- 4.Logto
- 5.SuperTokens
Grok
- 1.Authentik
- 2.Zitadel
- 3.Keycloak
- 4.Authelia
- 5.Ory
Common questions
What is the best self-hosted auth platform according to AI models?
Keycloak leads. 2 of 4 models rank Keycloak the top pick. The current top 3: Keycloak, Authentik, ZITADEL. Ranked by asking ChatGPT, Claude, Gemini, Grok the same buying question and merging their top-5 picks, updated 2026-07-16. Source: modelsagree.com.
Which self-hosted auth platform did each AI model pick first?
ChatGPT: Keycloak. Claude: Keycloak. Gemini: ZITADEL. Grok: Authentik.
Do the AI models agree on the best self-hosted auth platform?
Not unanimous. Gemini picks ZITADEL; Grok picks Authentik.
How is this self-hosted auth platform ranking made?
ChatGPT, Claude, Gemini, Grok are each asked the same buying question in a fresh session with no system steering. Their top-5 answers are merged (rank 1 = 5 pts … rank 5 = 1 pt) into the consensus ranking, re-polled weekly and tracked over time.
More on how polling works: full methodology →
This ranking moves
We re-poll all four models weekly. Get one short email when a #1 flips.
Cite this ranking
ModelsAgree, “Best self-hosted auth platform” — merged ranking from ChatGPT, Claude, Gemini & Grok, polled 2026-07-16. https://modelsagree.com/best/best-self-hosted-auth-platform (CC BY 4.0)
Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled weekly