Run: 2026-05-01-01KQHSTMP95AYHFJYQ71NF3FDX

Run Details

Model:: Grok 4.20 (Reasoning)
Test:: Data extraction
Scenario:: What instrument does Lucy play?
Duration:: 6.4s
Cost:: $0.001654
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, trumpet) and explicitly assigns three: John → drums, Mary → flute, Pete → trumpet. This leaves only bass unassigned. The additional clause that Lucy does not play a wind instrument (flute and trumpet are the wind instruments in the list) is therefore satisfied by bass, which is a string instrument. No other instrument remains that fits both the assignment logic and the wind-instrument constraint.

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