Run: 2026-05-01-01KQHSV22MQGK3QPRH8T8KX5Q7

Run Details

Model:: Grok 4.20 (Reasoning)
Test:: Data extraction
Scenario:: What instrument does Lucy play?
Duration:: 4.1s
Cost:: $0.001029
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—treating “trumped” as a typo for trumpet) and assigns three of them explicitly: John (drums), Mary (flute), Pete (trumpet). This leaves bass as the only unassigned instrument. The additional clause “Lucy doesn’t play a wind instrument” is satisfied because flute and trumpet are winds, whereas bass (whether electric or upright) is not. Therefore 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