{"slug":"cerbos","name":"Cerbos","domain":"cerbos.dev","best_rank":3,"categories":1,"entries":[{"slug":"best-fine-grained-authorization-engine-for-microservices","title":"Best fine-grained authorization engine for microservices","rank":3,"of":7,"score":8,"appearances":3,"modelRanks":{"ChatGPT":3,"Gemini":4,"Grok":3},"reason":"Excellent microservice ergonomics: stateless sidecar or centralized deployment, readable Git-managed resource and principal policies, strong ABAC/RBAC support, batch decisions, query-plan generation for filtering data, and no separate relationship database requirement.","reasons":[{"model":"ChatGPT","reason":"Excellent microservice ergonomics: stateless sidecar or centralized deployment, readable Git-managed resource and principal policies, strong ABAC/RBAC support, batch decisions, query-plan generation for filtering data, and no separate relationship database requirement."},{"model":"Grok","reason":"Purpose-built, lightweight self-hosted YAML policy engine for app-level authorization (RBAC/ABAC with some ReBAC); extremely fast local/sidecar PDPs ideal for microservices latency, simple policy-as-code, low ops overhead, deny-by-default, and strong performance benchmarks vs. OPA."},{"model":"Gemini","reason":"An excellent stateless policy-as-code engine designed for microservices sidecar deployment. It evaluates policies written in YAML/CEL with sub-millisecond latency, has a tiny footprint, and supports GitOps-based policy updates without requiring restarts or database synchronization."}],"fixes":[{"model":"ChatGPT","fix":"It is not the best fit for large, deeply connected ReBAC graphs because applications must supply the relevant principal and resource attributes."},{"model":"Gemini","fix":"Since it is stateless, microservices must query their own databases to fetch all user and resource attributes and pass them into the Cerbos request payload, complicating integration and increasing payload sizes."},{"model":"Grok","fix":"Less native strength for deep hierarchical ReBAC at global scale compared to Zanzibar options; better for teams preferring YAML over more expressive languages."}],"updated":"2026-07-16","api":"https://modelsagree.com/api/v1/best/best-fine-grained-authorization-engine-for-microservices.json"}],"page":"https://modelsagree.com/product/cerbos","check":"https://modelsagree.com/check?q=Cerbos","updated":"2026-07-17T08:03:51.047Z","attribution":"modelsagree.com, CC BY 4.0"}