Run: 2026-03-12-01KKHZFW1TF2QBJ8HX5PYHJ8QC

Run Details

Model:: Grok 4.20 (Beta, Reasoning)
Test:: Data extraction
Scenario:: What instrument does Lucy play?
Duration:: 3.6s
Cost:: $0.005258
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 (noting the clear typo in "trumped"). It explicitly assigns John to drums, Mary to flute, and Pete to trumpet. This leaves bass as the only unassigned instrument. The statement that Lucy "doesn't play a wind instrument" further confirms this, as flute and trumpet are wind instruments while bass (a string instrument) and drums (percussion) are not; drums are already taken by John. Thus, 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