Updated 2026-09-11
RAG evaluation metrics that matter
RAG evaluation metrics that matter measure whether the system retrieved the right evidence and answered without inventing facts. Fluency and embedding similarity alone miss the failures users feel in production.
Retrieval quality can look excellent until users stop asking clean demo questions.
Retrieval before generation
If the wrong chunk is retrieved, a perfect generator still fails. Score hit rate at k, citation coverage, and version freshness separately from answer style.
Groundedness and citations
Require answers to point at sources. Fluent wrong answers without citations are a product liability.
ACL and multi-tenant safety
Eval sets must include documents the user should not see. Multi-hop retrieval often leaks across ACL boundaries.
Match the query distribution
Pilot FAQs are not production queries. Sample messy, multi-intent, and stale-data questions.
Related Knackline capability
After the diagnosis, see how Knackline hardens this class of system in production.
Open production rag capabilityRelated reports
Production RAG for enterprise knowledge: why demos fail and what to measure instead
Assistants that answer well in demos often fail the first week of real tickets.
Tenant isolation for multi-tenant RAG: ACLs that survive multi-hop retrieval
Chunk filters applied once still leak across hops and summaries
GraphRAG when vector search is not enough: relational questions need structure
Nearest neighbors find similar paragraphs; they do not reliably answer who owns what across a changing org graph.
FAQ
- Is BLEU or ROUGE enough for RAG?
- No. Those scores reward surface similarity. Prefer retrieval hit rates, groundedness judgments, citation correctness, and task success for your domain.
- How often should RAG evals run?
- On every index or prompt change in CI, plus scheduled regression against a living failure set from production.
- What fails first in enterprise RAG?
- Wrong document version, missing citations, ACL leaks on multi-hop paths, and stale indexes after content moves.