Caesar AI Atlas

Unsupported-claim Rate (UCR)

Also known as: UCR Β· Unsupported claim Rate

Caesar AI Atlas Definition

UCR (unsupported-claim rate) is the percentage of claims in a model response that are not grounded in supporting evidence. A high UCR indicates that the system may be producing too many unsupported or hallucinated assertions.

Other Definitions

Unsupported-claim Rate Source

The percentage of claims in a response that aren't grounded. For example, if an LLM's response makes 10 claims but only 1 is grounded, the UCR is 90%. A high UCR implies that an LLM is hallucinating too frequently. See also citation precision and citation recall.

Concept Comparisons

MetricsEvaluation

Unsupported-claim Rate vs Hallucination

A side-by-side comparison of Unsupported-claim Rate and Hallucination. Understand how a measurement of unsupported claims relates to the broader failure of false or fabricated AI output.

Related Terms

ResponseCitation PrecisionGolden ResponseLearning RateGroundednessFalse Positive Rate