Run: 2026-03-12-01KKHZKHG74711Q9FC07PFM44V

Run Details

Model:: Grok 4.20 (Beta, Reasoning)
Test:: Data extraction
Scenario:: What instrument does Lucy play?
Duration:: 2.1s
Cost:: $0.003140
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, bass, flute, and trumpet (correcting the apparent typo "trumped"). It assigns John to drums, Mary to flute, and Pete to trumpet, leaving bass as the only unassigned instrument. Lucy is stated not to play a wind instrument; flute and trumpet are wind instruments, while drums and bass are not. Since drums is already assigned, Lucy must play 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