Run: 2026-05-01-01KQHR1R0S6WVRYWHQQFBWS0V7

Run Details

Model:: Grok 4.20 (Reasoning)
Test:: Data extraction
Scenario:: What instrument does Lucy play?
Duration:: 6.0s
Cost:: $0.001822
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 exactly four instruments (drums, bass, flute, trumpet) and explicitly assigns three of them: John → drums, Mary → flute, Pete → trumpet. This leaves only bass for Lucy. The additional clause “Lucy doesn’t play a wind instrument” is consistent with bass (a non-wind instrument) and rules out the two wind instruments (flute, trumpet) already assigned to Mary and Pete. No other instrument satisfies both the exhaustive list 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