The verdict
Permify appears in 1 AI-ranked category — best position #3 for relationship-based access control engine.
Fast-moving open-source Zanzibar-style engine that deliberately blends ReBAC with attribute-based rules in one schema, has a good playground and data-sync tooling for keeping relationships current from existing databases, and offers a lighter operational footprint than SpiceDB while supporting tenancy natively — strong value for mid-size teams wanting self-hosted FGA without a cluster.
Grok Solid OSS Zanzibar implementation with growing real-world adoption, strong multi-tenant focus, good performance, and developer-friendly design that balances fidelity to the model with practicality for SaaS teams.
GPT A practical open-source ReBAC engine with readable modeling, native multi-tenancy, contextual tuples, schema versioning, testing support, and useful RBAC/ABAC combinations; particularly compelling for multi-tenant SaaS teams wanting strong capabilities without adopting the largest platforms.
Gemini A developer-centric open-source engine with an elegant YAML-based schema modeler, built-in multi-tenancy support, and pluggable database backends (Postgres, MySQL, CockroachDB). It offers a lighter operational footprint than SpiceDB, making it an excellent middle-ground option for rapidly iterating teams.
Where Permify falls short, per the models
- GPT It has less production validation, ecosystem depth, operational documentation, and managed-service maturity than the leaders.
- Claude Much smaller community and production track record than SpiceDB/OpenFGA, and the commercial company behind it is young — a real bet on longevity for a system this load-bearing.
- Gemini Lacks the deep enterprise adoption, large-scale community ecosystem, and extensive client SDK catalog offered by OpenFGA or SpiceDB, resulting in a higher integration burden.
Top alternatives per the models: SpiceDB · OpenFGA · Ory Keto · Oso Cloud
Head-to-head — how the models call it
Watch Permify
Boards re-poll weekly and the models change their minds. One short email only when Permify's standing moves — a rank change, a rival overtaking, or new reasoning from the models. Nothing otherwise.
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Permify ranks #3 for best relationship-based access control engine by AI-model consensus. Put the badge in your README, docs or site — it updates automatically as the models re-rank.
[](https://modelsagree.com/best/best-relationship-based-access-control-engine?utm_source=badge&utm_medium=embed&utm_campaign=badge-permify)<a href="https://modelsagree.com/best/best-relationship-based-access-control-engine?utm_source=badge&utm_medium=embed&utm_campaign=badge-permify"><img src="https://modelsagree.com/badge/permify.svg" alt="Permify — ranked #3 for Best relationship-based access control engine by AI models on ModelsAgree" height="28"></a>Rankings are computed from what the models answer, re-polled weekly · raw reasoning shown verbatim · methodology