Run: 2026-09-23-01M37PRC57MK4AQ3M09W78N6KY

Run Details

Model:: Claude Opus 5.5 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 10 words each
Duration:: 20.2s
Cost:: $0.040488
Provider:: Claude Platform on AWS

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 storm arrived at Blackwood Manor just after midnight struck. Rain hammered the tall windows like fists demanding to enter. Inside, the guests gathered nervously around the library's dying fire. Lord Ashford had not appeared for dinner, which was unusual. His niece Clara kept glancing toward the locked study door. The butler, Graves, insisted his master simply wished for solitude. Nobody believed him, but nobody dared to say so aloud.

Then a single gunshot echoed through the dark, silent house. Clara screamed, and the doctor rushed toward the study immediately. Graves fumbled with his keys, his trembling hands betraying him. When the heavy door finally swung open, everyone froze completely. Lord Ashford lay slumped across his desk, a pistol nearby. The window was bolted, and his key lay beside him.

Yet the doctor noticed something strange about the fresh wound. There were no powder burns, and the blood was cold. Lord Ashford had been dead long before that gunshot rang. Someone in this house was lying, and Clara knew it.

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
10	10
11	10
12	10
13	10
14	10
15	10
16	10