Run: 2026-05-01-01KQHT4FN7TGVK0HVR4D8HHYWS

Run Details

Model:: Grok 4.20 (Reasoning)
Test:: Data extraction
Scenario:: Contextual pronoun
Duration:: 9.5s
Cost:: $0.001503
Provider:: xAI

Evaluation summary

Score	Evaluator	Details Link
Fail	Matches text	(details)
Pass	Matches Regex	(details)
no eval	Overall

Model input

User/Human

Who does "he" refer to in the last sentence? Only return the name.

Tom and Jerry were playing in the yard. Spike, the dog, was watching them from his kennel. Suddenly, he started barking loudly.

Model response

Spike

The pronoun "he" in the final sentence corefers to the most salient antecedent that fits the predicate ("started barking loudly"). The second sentence introduces "Spike, the dog" as the subject and sole male animate entity; dogs bark, while Tom (cat) and Jerry (mouse) do not. No other plausible referent appears between the antecedent and the pronoun, so coreference to Spike follows both syntactic recency and semantic fit.

Evaluation details

Result	Evaluator	Details	Meta Data
Fail	Matches text	Case sensitive: Spike	n/a
Pass	Matches Regex	/\bSpike\b/	n/a
no eval