{"slug":"keycloak","name":"Keycloak","domain":"keycloak.org","verdict":"As of 2026-07-16, ChatGPT, Claude, Gemini, Grok collectively rank Keycloak first for self-hosted oauth and openid connect server (one of 11 leaderboards it appears on). Source: https://modelsagree.com/product/keycloak (modelsagree.com, CC BY 4.0).","best_rank":1,"categories":11,"brief":{"category":"best-self-hosted-auth-platform","title":"Best self-hosted auth platform","rank":1,"of":8,"top":null,"day":"2026-07-16","why":[{"t":"battle-tested at enterprise scale","m":["Claude","Gemini","Grok"],"q":"battle-tested at enterprise scale"},{"t":"unmatched protocol support","m":["ChatGPT","Claude","Gemini","Grok"],"q":"unmatched protocol support"},{"t":"enterprise directory federation","m":["ChatGPT","Claude","Gemini","Grok"],"q":"comprehensive enterprise directory federation"},{"t":"fine-grained authorization","m":["ChatGPT","Claude","Grok"],"q":"fine-grained authorization"}],"gap":[],"fix":[{"t":"Operationally heavy","m":["ChatGPT","Claude","Gemini"],"q":"Operationally heavy"},{"t":"steep learning curve","m":["ChatGPT","Claude"],"q":"steep learning curve"},{"t":"complex upgrade paths","m":["Gemini"],"q":"complex upgrade paths"}]},"entries":[{"slug":"best-self-hosted-oauth-and-openid-connect-server","title":"Best self-hosted OAuth and OpenID Connect server","rank":1,"of":7,"score":19,"appearances":4,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":2,"Grok":1},"reason":"The strongest all-round choice: mature OAuth 2.0/OIDC and SAML support, identity brokering, LDAP/AD federation, MFA/passkeys, fine-grained authorization, extensive customization, and a large operational knowledge base; best when broad standards coverage matters more than simplicity","reasons":[{"model":"ChatGPT","reason":"The strongest all-round choice: mature OAuth 2.0/OIDC and SAML support, identity brokering, LDAP/AD federation, MFA/passkeys, fine-grained authorization, extensive customization, and a large operational knowledge base; best when broad standards coverage matters more than simplicity"},{"model":"Claude","reason":"The default answer for a reason — CNCF-graduated, battle-tested at enterprise scale, and covers nearly everything out of the box: OIDC/OAuth2/SAML, user federation (LDAP/AD), identity brokering, fine-grained authorization, admin console, and a huge extension ecosystem; Red Hat backing (as build of RHBK) gives it long-term credibility, and the newer Quarkus-based distribution cut its historical resource bloat considerably. Assumption: the typical practitioner wants a full IdP, not just a protocol server."},{"model":"Grok","reason":"Mature CNCF-backed enterprise standard with broadest protocol support (full OIDC, OAuth 2.0, SAML 2.0 IdP/SP, LDAP/AD federation, Kerberos), deep customization via SPIs, fine-grained authz (UMA), huge ecosystem/community, Red Hat support option, battle-tested at massive scale for typical self-hosted needs. Assumption: most practitioners value proven stability and integration breadth over minimalism."},{"model":"Gemini","reason":"Battle-tested enterprise reliability with unmatched protocol support (SAML, LDAP, Kerberos, OIDC) and a massive plug-in community."}],"fixes":[{"model":"ChatGPT","fix":"Its realm model, configuration surface, upgrades, and production clustering create substantial administrative complexity for small teams"},{"model":"Claude","fix":"Operational heaviness remains real — JVM footprint, clustering/upgrade complexity, and a sprawling admin model make it overkill for small teams who need only OIDC login for a few apps."},{"model":"Gemini","fix":"Extremely heavy JVM-based resource footprint and steep learning curve, making it ill-suited for low-resource hosting or simple projects."}],"updated":"2026-07-16","api":"https://modelsagree.com/api/v1/best/best-self-hosted-oauth-and-openid-connect-server.json"},{"slug":"best-self-hosted-auth-platform","title":"Best self-hosted auth platform","rank":1,"of":8,"score":17,"appearances":4,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":2,"Grok":3},"reason":"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","reasons":[{"model":"ChatGPT","reason":"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"},{"model":"Claude","reason":"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."},{"model":"Gemini","reason":"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."},{"model":"Grok","reason":"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."}],"fixes":[{"model":"ChatGPT","fix":"Operationally heavy and comparatively awkward to customize into a polished, product-native SaaS experience"},{"model":"Claude","fix":"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."},{"model":"Gemini","fix":"High operational overhead due to its heavy JVM/Quarkus footprint and complex upgrade paths that require dedicated DevOps support."}],"updated":"2026-07-16","api":"https://modelsagree.com/api/v1/best/best-self-hosted-auth-platform.json"},{"slug":"best-self-hosted-customer-identity-platforms","title":"Best self-hosted customer identity platforms","rank":1,"of":7,"score":15,"appearances":3,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":1},"reason":"The best all-round value: mature, fully open-source, highly extensible, and unusually broad across OIDC, OAuth, SAML, federation, organizations, passkeys, authorization, and deployment patterns. It narrowly beats ZITADEL when protocol breadth, longevity, and avoiding feature licenses matter most.","reasons":[{"model":"ChatGPT","reason":"The best all-round value: mature, fully open-source, highly extensible, and unusually broad across OIDC, OAuth, SAML, federation, organizations, passkeys, authorization, and deployment patterns. It narrowly beats ZITADEL when protocol breadth, longevity, and avoiding feature licenses matter most."},{"model":"Claude","reason":"The mature, battle-tested standard for self-hosting — full OIDC/OAuth2/SAML, identity brokering, social login, fine-grained authz, and a vast community with abundant tutorials, operators, and Kubernetes tooling; Red Hat backing means it isn't going anywhere and it costs nothing."},{"model":"Gemini","reason":"Battle-tested open-source benchmark for enterprise CIAM offering complete protocol support (OIDC, OAuth2, SAML 2.0), robust user federation, fine-grained access control, and deep Java SPI customization. Ranked top under the assumption that long-term protocol stability and zero-vendor-lock-in outweigh setup complexity for typical enterprise deployments."}],"fixes":[{"model":"ChatGPT","fix":"Production customization and multi-cluster operation demand substantial identity and platform expertise; SCIM remains preview-grade."},{"model":"Claude","fix":"Heavy JVM footprint and operationally complex to run reliably at scale; its lineage is workforce/enterprise IAM, so consumer-scale UX customization and high-volume tuning take real effort, and the admin experience feels dated."},{"model":"Gemini","fix":"High memory footprint and a steep administration learning curve make simple app integrations unnecessarily over-engineered for lean teams."}],"updated":"2026-08-04","api":"https://modelsagree.com/api/v1/best/best-self-hosted-customer-identity-platforms.json"},{"slug":"best-machine-to-machine-authentication-platforms-for-apis","title":"Best machine-to-machine authentication platforms for APIs","rank":3,"of":9,"score":7,"appearances":2,"modelRanks":{"ChatGPT":3,"Gemini":2},"reason":"Powerful open-source OAuth2 and OIDC server supporting Client Credentials grants and service accounts with fine-grained authorization and full data sovereignty. Near-tie with Auth0 on feature breadth, but ranks higher due to cost predictability.","reasons":[{"model":"Gemini","reason":"Powerful open-source OAuth2 and OIDC server supporting Client Credentials grants and service accounts with fine-grained authorization and full data sovereignty. Near-tie with Auth0 on feature breadth, but ranks higher due to cost predictability."},{"model":"ChatGPT","reason":"The strongest self-hosted general-purpose option: mature OAuth/OIDC, service accounts, detailed role mappings, signed-JWT and federated workload credentials, DPoP, extensive customization, and no license-based token limits."}],"fixes":[{"model":"ChatGPT","fix":"Operating, upgrading, securing, and scaling it is substantial infrastructure work."},{"model":"Gemini","fix":"Substantial memory footprint and ongoing operational overhead for self-hosted cluster maintenance and updates."}],"updated":"2026-08-04","api":"https://modelsagree.com/api/v1/best/best-machine-to-machine-authentication-platforms-for-apis.json"},{"slug":"best-customer-identity-platform-for-regulated-enterprises","title":"Best customer identity platform for regulated enterprises","rank":3,"of":11,"score":6,"appearances":2,"modelRanks":{"Claude":4,"Gemini":2},"reason":"Represents the open-source industry standard, granting regulated enterprises absolute data sovereignty with zero license fees and near-infinite extensibility to integrate with complex legacy backends.","reasons":[{"model":"Gemini","reason":"Represents the open-source industry standard, granting regulated enterprises absolute data sovereignty with zero license fees and near-infinite extensibility to integrate with complex legacy backends."},{"model":"Claude","reason":"The strongest open-source option — full self-hosting gives absolute data residency and audit control that regulators love, certified OpenID Connect/FAPI implementation, and a hardened commercial path via Red Hat Build of Keycloak; CNCF graduation solidified its governance and longevity."}],"fixes":[{"model":"Claude","fix":"You own the operational and security burden entirely — HA clustering, upgrades, custom SPI maintenance, and threat monitoring require a dedicated team; total cost of ownership often exceeds SaaS for lean orgs."},{"model":"Gemini","fix":"Shifts the entire operational, patching, high-availability, and compliance auditing burden to the enterprise's internal engineering team."}],"updated":"2026-07-16","api":"https://modelsagree.com/api/v1/best/best-customer-identity-platform-for-regulated-enterprises.json"},{"slug":"best-authentication-provider-for-b2b-saas","title":"Best Authentication provider for B2B SaaS","rank":6,"of":8,"score":4,"appearances":2,"modelRanks":{"Claude":4,"Gemini":4},"reason":"The strongest open-source option — battle-tested (CNCF, Red Hat-backed), full SAML/OIDC IdP + broker, user federation, fine-grained roles, self-hostable for free with no per-MAU or per-connection fees; the right answer for teams with ops capacity, data-residency constraints, or cost-sensitive scale.","reasons":[{"model":"Claude","reason":"The strongest open-source option — battle-tested (CNCF, Red Hat-backed), full SAML/OIDC IdP + broker, user federation, fine-grained roles, self-hostable for free with no per-MAU or per-connection fees; the right answer for teams with ops capacity, data-residency constraints, or cost-sensitive scale."},{"model":"Gemini","reason":"Industry standard open-source identity server offering total data sovereignty, multi-realm isolation, and SAML/OIDC brokering with zero licensing fees; assumes team has dedicated DevOps capacity to manage infrastructure."}],"fixes":[{"model":"Claude","fix":"You run and secure it yourself — upgrades, HA, theming its dated admin/login UX, and building multi-tenant B2B org semantics on top are real ongoing engineering costs; no vendor SLA unless you pay Red Hat."},{"model":"Gemini","fix":"Substantial operational burden, complex Java runtime configuration, and legacy administration tools requiring heavy maintenance."}],"updated":"2026-07-19","api":"https://modelsagree.com/api/v1/best/best-authentication-provider-for-b2b-saas.json"},{"slug":"best-auth-provider","title":"Best authentication provider for web apps","rank":6,"of":10,"score":4,"appearances":2,"modelRanks":{"Claude":5,"Gemini":3},"reason":"The gold standard for fully featured, open-source, and self-hosted IAM, supporting OAuth2, OIDC, SAML, and user federation with zero vendor lock-in or license costs.","reasons":[{"model":"Gemini","reason":"The gold standard for fully featured, open-source, and self-hosted IAM, supporting OAuth2, OIDC, SAML, and user federation with zero vendor lock-in or license costs."},{"model":"Claude","reason":"The battle-tested open-source IdP — full OIDC/SAML server, user federation (LDAP/AD), fine-grained authorization, CNCF-backed with Red Hat pedigree, free at any scale and deployable in regulated or air-gapped environments no SaaS provider can serve."}],"fixes":[{"model":"Claude","fix":"Significant operational burden — a heavyweight Java service with a dated admin console and non-trivial upgrade/theming work; overkill for a small team that just needs login on one app."},{"model":"Gemini","fix":"High operational complexity and steep learning curve, requiring dedicated engineering resources to configure, theme, and scale in production."}],"updated":"2026-07-15","rank_history":{"days":["2026-06-29","2026-07-08","2026-07-09","2026-07-10","2026-07-14","2026-07-15"],"ranks":[null,null,7,null,8,5]},"reasoning_shift":[{"model":"Gemini","from":"2026-07-14","to":"2026-07-15","added":[{"t":"Protocol and federation support","q":"supporting OAuth2, OIDC, SAML, and user federation"},{"t":"Zero vendor lock-in","q":"zero vendor lock-in"}],"dropped":[{"t":"Battle-tested custom deployments","q":"serving as a battle-tested choice for custom deployments"},{"t":"Infrastructure overhead versus SaaS","q":"infrastructure overhead"},{"t":"Securing and maintaining deployments","q":"deploy, secure, scale, and maintain"}]}],"api":"https://modelsagree.com/api/v1/best/best-auth-provider.json"},{"slug":"best-enterprise-sso-apis-for-b2b-saas","title":"Best enterprise SSO APIs for B2B SaaS","rank":6,"of":7,"score":1,"appearances":1,"modelRanks":{"Gemini":5},"reason":"Top open-source IAM engine delivering robust enterprise SAML/OIDC standards compliance with zero licensing costs and full control over data and infrastructure.","reasons":[{"model":"Gemini","reason":"Top open-source IAM engine delivering robust enterprise SAML/OIDC standards compliance with zero licensing costs and full control over data and infrastructure."}],"fixes":[{"model":"Gemini","fix":"High self-hosting operational complexity and ongoing maintenance overhead for scaling high-availability deployments."}],"updated":"2026-08-03","api":"https://modelsagree.com/api/v1/best/best-enterprise-sso-apis-for-b2b-saas.json"},{"slug":"best-customer-identity-platforms-for-multi-tenant-b2b-saas","title":"Best customer identity platforms for multi-tenant B2B SaaS","rank":7,"of":9,"score":1,"appearances":1,"modelRanks":{"Claude":5},"reason":"The strongest open-source, self-hostable option — realms give hard tenant isolation, full standards support (OIDC/SAML/SCIM via extensions), no per-MAU fees, and total data control for regulated or cost-sensitive orgs; huge community and RedHat backing.","reasons":[{"model":"Claude","reason":"The strongest open-source, self-hostable option — realms give hard tenant isolation, full standards support (OIDC/SAML/SCIM via extensions), no per-MAU fees, and total data control for regulated or cost-sensitive orgs; huge community and RedHat backing."}],"fixes":[{"model":"Claude","fix":"You own the operational burden (HA, upgrades, scaling, security patching) with no managed SLA, and the realm-per-tenant model strains past hundreds/thousands of tenants — wrong choice for a team without platform/ops capacity."}],"updated":"2026-08-03","api":"https://modelsagree.com/api/v1/best/best-customer-identity-platforms-for-multi-tenant-b2b-saas.json"},{"slug":"best-multi-tenant-b2b-authentication-platform-for-saas","title":"Best multi-tenant B2B authentication platform for SaaS","rank":8,"of":9,"score":2,"appearances":1,"modelRanks":{"Claude":4},"reason":"The strongest open-source option — battle-tested, CNCF-graduated, full SAML/OIDC IdP and broker with realms/organizations for tenant isolation, fine-grained authorization, and zero license cost at any scale; the right answer for teams with ops capacity, data-residency or self-hosting mandates, or unwillingness to pay per-MAU forever.","reasons":[{"model":"Claude","reason":"The strongest open-source option — battle-tested, CNCF-graduated, full SAML/OIDC IdP and broker with realms/organizations for tenant isolation, fine-grained authorization, and zero license cost at any scale; the right answer for teams with ops capacity, data-residency or self-hosting mandates, or unwillingness to pay per-MAU forever."}],"fixes":[{"model":"Claude","fix":"You own the operational burden — upgrades, HA, theming its dated UX, and building the B2B self-service layers (customer-facing SSO onboarding, SCIM niceties) that commercial rivals ship out of the box; slow for a small team to reach polish."}],"updated":"2026-07-16","api":"https://modelsagree.com/api/v1/best/best-multi-tenant-b2b-authentication-platform-for-saas.json"},{"slug":"best-workforce-sso-platform-for-mid-sized-companies","title":"Best workforce SSO platform for mid-sized companies","rank":8,"of":8,"score":1,"appearances":1,"modelRanks":{"Claude":5},"reason":"The strongest open-source option — battle-tested SAML/OIDC IdP with federation to LDAP/AD, no per-user fees, and full control for companies with compliance or data-residency constraints; earns the spot on merit for teams with ops capacity","reasons":[{"model":"Claude","reason":"The strongest open-source option — battle-tested SAML/OIDC IdP with federation to LDAP/AD, no per-user fees, and full control for companies with compliance or data-residency constraints; earns the spot on merit for teams with ops capacity"}],"fixes":[{"model":"Claude","fix":"It's a workforce SSO toolkit, not a product — no app catalog, no SCIM provisioning out of the box, and self-hosting/upgrading it is a permanent engineering tax most mid-sized IT teams shouldn't take on"}],"updated":"2026-07-16","api":"https://modelsagree.com/api/v1/best/best-workforce-sso-platform-for-mid-sized-companies.json"}],"page":"https://modelsagree.com/product/keycloak","check":"https://modelsagree.com/check?q=Keycloak","updated":"2026-08-10T18:18:45.051Z","attribution":"modelsagree.com, CC BY 4.0"}