Run: 2026-06-01-01KT1J52HE0RJ61SEBZEMEK8M6

Run Details

Model:: Claude Opus 4.8 (Reasoning, Low)
Test:: N-Length Sentences
Scenario:: Write sentences with 10 words each
Duration:: 36.1s
Cost:: $0.027050
Provider:: Anthropic

Evaluation summary

Score	Evaluator	Details Link
100.00%	Matches word count	(details)

Model input

User/Human

Please write the opening scene of a murder mystery where each sentence has exactly 10 words.
Please make sure that each sentence has the same length. Only return the opening itself.

Model response

The rain fell hard against the old mansion's tall windows.
Detective Sarah Cole stepped through the heavy oak front door.
Inside, the air smelled of smoke, blood, and stale wine.
A body lay sprawled across the cold marble entrance floor.
The victim was Harold Grey, the wealthy owner of everything.
His eyes stared up, frozen wide with sudden, silent terror.
Five guests waited nervously inside the dim, candlelit dining room.
Each one had reasons to want the old man dead.
Sarah knelt beside him, studying the deep crimson wound carefully.
Someone in this house had committed murder tonight, she thought.

Evaluation details

Result

Evaluator

Details

Meta Data

100.00%

Matches word count

n/a

neededClean

false

sentences

wordCounts

0	10
1	10
2	10
3	10
4	10
5	10
6	10
7	10
8	10
9	10