Run: 2026-09-23-01M37NYPCC6H0S4QH5P4PZNHW1

Run Details

Model:: Claude Opus 5.5 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 5 words each
Duration:: 10.2s
Cost:: $0.016388
Provider:: Claude Platform on AWS

Evaluation summary

Score	Evaluator	Details Link
95.83%	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 on Blackwood. Thunder shook the old manor. Inside, the guests gathered nervously. Lord Ashford had not appeared. His chair sat empty, waiting. The butler checked his watch. Midnight crept closer every minute.

Then a scream pierced everything. Everyone rushed toward the library. The heavy door stood open. Candlelight flickered across the floor. Lord Ashford lay there, motionless. A silver dagger gleamed nearby. Blood pooled beneath his head.

Lady Margaret gasped and fainted. The doctor knelt beside him. "He is dead," he whispered. Nobody spoke for a moment. Outside, the storm raged on. The roads were completely flooded. No one could leave tonight.

Detective Harlow stepped forward slowly. She studied each pale face. "The killer is among us." Her voice was calm, certain.

Evaluation details

Result

Evaluator

Details

Meta Data

95.83%

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	5
19	5
20	5
21	5
22	5
23	10