Run: 2026-09-23-01M37PF2XPYAXTA7HQFDXK3WCM

Run Details

Model:: Claude Opus 5.5 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 5 words each
Duration:: 12.0s
Cost:: $0.017068
Provider:: Claude Platform on AWS

Evaluation summary

Score	Evaluator	Details Link
95.45%	Matches word count	(details)

Model input

User/Human

Please write the opening scene of a murder mystery where each sentence has exactly 5 words.
Please make sure that each sentence has the same length. Only return the opening itself.

Model response

The rain fell without mercy. Thornfield Manor stood in darkness. Inside, the grandfather clock stopped. Lady Ashworth screamed at midnight. Her guests rushed down stairs. They found the library door. Someone had locked it tight. The butler fetched his keys. His hands trembled with fear. The heavy door creaked open. Lord Ashworth lay face down. A silver dagger pierced him. Blood stained the Persian rug. Silence swallowed the entire room. Then the youngest daughter fainted. Detective Graves stepped from shadows. Nobody had seen him arrive. He studied each pale face. "Nobody leaves this house tonight." His voice was cold steel. The storm howled against windows. One guest smiled very slightly. The killer was among them.

Evaluation details

Result

Evaluator

Details

Meta Data

95.45%

Matches word count

n/a

neededClean

false

sentences

wordCounts

0	5
1	5
2	5
3	5
4	5
5	5
6	5
7	5
8	5
9	5
10	5
11	5
12	5
13	5
14	5
15	5
16	5
17	5
18	10
19	5
20	5
21	5