Run: 2026-03-12-01KKHYV9A7A8G9Q8Y7P7FJ13PT

Run Details

Model:: Grok 4.20 (Beta, Reasoning)
Test:: Data extraction
Scenario:: What instrument does Lucy play?
Duration:: 4.7s
Cost:: $0.005109
Provider:: xAI

Evaluation summary

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

Model input

User/Human

What instrument does Lucy play based on the following text? Only return the instrument, nothing else.

In the school band, there are four instruments: drums, bass, flute, trumped.
John plays the drums, Mary plays the flute, and Pete plays the trumpet. Lucy doesn't play a wind instrument.

Model response

bass

The text lists four instruments: drums (John), flute (Mary), trumpet (Pete), leaving bass as the only unassigned instrument. Lucy explicitly does not play a wind instrument (flute and trumpet are wind instruments; drums and bass are not). By process of elimination, Lucy plays bass.

Evaluation details

Result	Evaluator	Details	Meta Data
Fail	Matches text	Case insensitive: bass	n/a
Pass	Matches Regex	/\bbass\b/i	n/a
no eval