{"slug":"best-enterprise-sso-apis-for-b2b-saas","title":"Best enterprise SSO APIs for B2B SaaS","question":"What are the best enterprise SSO APIs for B2B SaaS in 2026?","verdict":"As of 2026-08-03, ChatGPT, Claude and Gemini collectively rank WorkOS #1 for enterprise sso apis for b2b saas on ModelsAgree — unanimous among the 3 models that have answered. The models' case: Best modular choice for adding SAML/OIDC SSO to an existing B2B SaaS without replacing its auth stack. The models' main caveat: At $125 per production SSO connection, costs become substantial as the customer count grows. The strongest alternative is Auth0 — The most battle-tested option — enterprise connections, SAML/OIDC, SCIM via Okta, extensible rules/actions, and organizations for B2B multi-tenant. Source: https://modelsagree.com/best/best-enterprise-sso-apis-for-b2b-saas (modelsagree.com, CC BY 4.0).","category":"Auth","url":"https://modelsagree.com/best/best-enterprise-sso-apis-for-b2b-saas","updated":"2026-08-03","models":["ChatGPT","Claude","Gemini"],"consensus":"All 3 models rank WorkOS the top pick","disagreement":null,"combined":[{"rank":1,"product":"WorkOS","domain":"workos.com","score":15,"appearances":3,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":1},"reason":"Best modular choice for adding SAML/OIDC SSO to an existing B2B SaaS without replacing its auth stack; excellent APIs, broad IdP coverage, self-service Admin Portal, domain verification, and optional Directory Sync. This assumes retrofit value matters most."},{"rank":2,"product":"Auth0","domain":"auth0.com","score":9,"appearances":3,"modelRanks":{"ChatGPT":5,"Claude":2,"Gemini":2},"reason":"The most battle-tested option — enterprise connections, SAML/OIDC, SCIM via Okta, extensible rules/actions, and organizations for B2B multi-tenant; deepest compliance, SDK, and ecosystem coverage of anything here."},{"rank":3,"product":"Stytch","domain":"stytch.com","score":9,"appearances":3,"modelRanks":{"ChatGPT":2,"Claude":3,"Gemini":4},"reason":"Strongest value for a new B2B identity stack: native organizations, SSO, SCIM, RBAC, JIT provisioning, and an embeddable admin portal, with five enterprise connections and 10,000 active users free."},{"rank":4,"product":"Descope","domain":"descope.com","score":5,"appearances":2,"modelRanks":{"ChatGPT":4,"Gemini":3},"reason":"Flexible B2B-native platform pairing drag-and-drop workflow customization with developer SDKs to streamline complex enterprise SSO, tenant isolation, and RBAC implementation."},{"rank":5,"product":"Frontegg","domain":"frontegg.com","score":5,"appearances":2,"modelRanks":{"ChatGPT":3,"Claude":4},"reason":"Exceptionally complete B2B platform combining SAML/OIDC, SCIM, tenant policies, authorization, entitlements, audit logs, and a polished embedded self-service portal; a near-tie with Descope, winning for administrative depth."},{"rank":6,"product":"Keycloak","domain":"keycloak.org","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."},{"rank":7,"product":"SSOReady","domain":null,"score":1,"appearances":1,"modelRanks":{"Claude":5},"reason":"Open-source, narrowly scoped SAML (and OIDC) library/service that does enterprise SSO login without vendor lock-in or per-connection pricing; ideal when you want to own the code and avoid a metered bill as enterprise customers multiply."}],"perModel":{"ChatGPT":[{"rank":1,"product":"WorkOS","reason":"Best modular choice for adding SAML/OIDC SSO to an existing B2B SaaS without replacing its auth stack; excellent APIs, broad IdP coverage, self-service Admin Portal, domain verification, and optional Directory Sync. This assumes retrofit value matters most.","fix":"At $125 per production SSO connection, costs become substantial as the customer count grows."},{"rank":2,"product":"Stytch","reason":"Strongest value for a new B2B identity stack: native organizations, SSO, SCIM, RBAC, JIT provisioning, and an embeddable admin portal, with five enterprise connections and 10,000 active users free.","fix":"It is best adopted as the primary authentication system, not as a lightweight SSO layer over a mature existing stack."},{"rank":3,"product":"Frontegg","reason":"Exceptionally complete B2B platform combining SAML/OIDC, SCIM, tenant policies, authorization, entitlements, audit logs, and a polished embedded self-service portal; a near-tie with Descope, winning for administrative depth.","fix":"Its broad, opinionated platform introduces more integration surface and lock-in than teams needing only an SSO API should accept."},{"rank":4,"product":"Descope","reason":"Flexible tenant-native SAML/OIDC with multiple IdPs per tenant, SCIM, customer self-configuration, visual authentication flows, and unusually good migration support for existing SSO connections; nearly tied with Frontegg.","fix":"Its flow-centric CIAM model adds unnecessary abstraction for teams wanting a narrow, code-first SSO bridge."},{"rank":5,"product":"Auth0","reason":"Technically capable and highly extensible, with Organizations, enterprise connections, self-service SSO, SCIM, mature protocol support, and a newly useful free B2B entry tier.","fix":"Organization limits, plan entitlements, and layered connection configuration make scaling and operating B2B tenancy more complicated than with purpose-built alternatives."}],"Claude":[{"rank":1,"product":"WorkOS","reason":"Purpose-built for exactly this problem — drop-in SAML/OIDC enterprise SSO plus SCIM directory sync, with a normalized API that abstracts away the per-IdP quirks (Okta, Entra ID, Ping, Google) that eat weeks of eng time; admin portal lets your customers self-configure their IdP without your team on the call; free up to a generous connection tier, so it fits early-stage GTM. Assumes the typical buyer is a B2B SaaS team adding \"Enterprise plan\" SSO, not building a full CIAM.","fix":"It is a B2B enterprise-connection layer, not a full end-user identity/auth platform — if you want your primary login, MFA, and user store all in one, you still bolt it onto something else, and per-connection pricing scales with enterprise deal count."},{"rank":2,"product":"Auth0","reason":"The most battle-tested option — enterprise connections, SAML/OIDC, SCIM via Okta, extensible rules/actions, and organizations for B2B multi-tenant; deepest compliance, SDK, and ecosystem coverage of anything here.","fix":"Cost and complexity climb fast at enterprise-connection scale, and its B2B/organizations story feels retrofitted onto a CIAM core — you pay for and configure far more platform than a pure SSO layer needs."},{"rank":3,"product":"Stytch","reason":"Strong developer-first B2B suite — SSO (SAML/OIDC), SCIM, RBAC, and organizations modeled as first-class primitives, with clean APIs and honest usage-based pricing; genuinely competes with WorkOS on the same B2B use case. Near-tie with #4 on B2B focus.","fix":"Younger ecosystem and smaller enterprise track record than Okta; you're betting on a platform still filling out the long tail of IdP edge cases and integrations."},{"rank":4,"product":"Frontegg","reason":"B2B-native from the ground up — self-serve enterprise SSO, SCIM, org management, and admin portals plus embeddable end-user account/login UI, so it covers more of the \"enterprise-ready SaaS\" surface than a pure SSO API.","fix":"More opinionated and heavyweight — you adopt its UI/tenancy model, which is friction if you already have your own auth and just want the SSO/SCIM connection layer."},{"rank":5,"product":"SSOReady","reason":"Open-source, narrowly scoped SAML (and OIDC) library/service that does enterprise SSO login without vendor lock-in or per-connection pricing; ideal when you want to own the code and avoid a metered bill as enterprise customers multiply.","fix":"Deliberately minimal — no SCIM directory sync, MFA, or managed admin portal to the depth of the commercial players, so you build and operate the surrounding infrastructure yourself."}],"Gemini":[{"rank":1,"product":"WorkOS","reason":"Purpose-built for B2B SaaS enterprise features with drop-in APIs for SAML/OIDC SSO, SCIM directory sync, and pre-built Admin Portals that cut integration time from months to hours.","fix":"Per-connection monthly pricing can scale steeply as enterprise customer counts grow compared to self-hosted or flat-rate options."},{"rank":2,"product":"Auth0","reason":"Industry-standard protocol support, massive IdP integration ecosystem, and granular Auth0 Actions extensibility for handling complex multi-tenant B2B SSO edge cases.","fix":"High enterprise pricing tiers and legacy platform overhead compared to modern B2B-native identity APIs."},{"rank":3,"product":"Descope","reason":"Flexible B2B-native platform pairing drag-and-drop workflow customization with developer SDKs to streamline complex enterprise SSO, tenant isolation, and RBAC implementation.","fix":"Smaller community footprint and fewer third-party integrations than legacy identity providers."},{"rank":4,"product":"Stytch","reason":"Developer-first headless auth API with clear organization-level multi-tenancy, clean SAML/OIDC SSO endpoints, and transparent usage pricing without forced UI templates.","fix":"Requires developers to build their own frontend enterprise connection management portals."},{"rank":5,"product":"Keycloak","reason":"Top open-source IAM engine delivering robust enterprise SAML/OIDC standards compliance with zero licensing costs and full control over data and infrastructure.","fix":"High self-hosting operational complexity and ongoing maintenance overhead for scaling high-availability deployments."}]},"missedByModel":{"ChatGPT":[{"product":"BoxyHQ Jackson","reason":"valuable Apache-licensed self-hosting option, but transfers security, reliability, upgrades, and IdP edge-case support to your team"},{"product":"Clerk","reason":"excellent developer experience and organization features, but enterprise SSO/SCIM remains less compelling as a dedicated enterprise-integration layer than the top five"}],"Claude":[{"product":"Descope","reason":"excellent no-code flow builder and SSO/SCIM, but the visual-flow model is its center of gravity and it's a narrower enterprise track record than the top picks"},{"product":"Keycloak/Ory","reason":"powerful open-source identity, but they're general IdP/CIAM engines you must operate and adapt into a B2B SSO layer — heavier lift than the purpose-built options above"}],"Gemini":[{"product":"Clerk","reason":"focused primarily on SMB and consumer auth flows, with enterprise SAML and SCIM capabilities less mature for complex IdPs"},{"product":"Ory","reason":"flexible open-source architecture that requires manual integration of distinct services to achieve full turnkey enterprise SSO"}]}}