Run: 2026-07-25-01KYCPQ7K1K270G5F3FFHMFDQQ

Run Details

Model:: Claude Opus 5
Test:: N-Length Sentences
Scenario:: Write sentences with 5 words each
Duration:: 9.6s
Cost:: $0.009025
Provider:: Amazon Bedrock

Evaluation summary

Score	Evaluator	Details Link
91.28%	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

Rain hammered the library windows. Inspector Vance removed her gloves. The body lay face-down. Blood pooled beneath the desk. A brass letter opener gleamed. Someone had wiped it clean. Vance crouched beside the corpse. The victim wore evening clothes. His left shoe was missing. That detail bothered her deeply. Behind her, the door creaked. "Nobody touched anything," Sergeant Doyle promised. Vance did not believe him. Footprints marked the Persian carpet. Three sets, all going outward. None of them came inward. She studied the tall shelves. One book sat slightly forward. Vance pulled it out slowly. Behind it, a hollow space. Inside, a woman's pearl earring. Doyle whistled through his teeth. "The wife owns those pearls." Vance dropped it in evidence. "Then where is she now?" Doyle's silence answered her question. Thunder shook the old house. Somewhere upstairs, a floorboard groaned. Vance drew her service weapon. The night had barely started.

Evaluation details

Result

Evaluator

Details

Meta Data

91.28%

Matches word count

n/a

neededClean

false

sentences

wordCounts

0	5
1	5
2	4
3	5
4	5
5	5
6	5
7	5
8	5
9	5
10	5
11	6
12	5
13	5
14	5
15	5
16	5
17	5
18	5
19	5
20	5
21	5
22	10
23	10
24	5
25	5
26	5
27	5