Run: 2026-03-12-01KKHYVKGM83M15W1Z5WAB238H

Run Details

Model:: Grok 4.20 (Beta)
Test:: Data extraction
Scenario:: What instrument does Lucy play?
Duration:: 749ms
Cost:: $0.000683
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 but only names three players for drums, flute, and trumpet. This leaves bass as the only instrument Lucy could play. The final sentence confirms she does not play a wind instrument (flute or trumpet), ruling those out and leaving drums or bass; however, drums are already assigned to John, so 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