Run: 2026-05-31-01KSYXKB22829FBTREAPJ3XWK2

Run Details

Model:: Claude Opus 4.8 (Reasoning, High)
Test:: N-Length Sentences
Scenario:: Write sentences with 5 words each
Duration:: 7.2s
Cost:: $0.006350
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 5 words.
Please make sure that each sentence has the same length. Only return the opening itself.

Model response

Rain fell against the window. The mansion stood in darkness. Detective Morgan arrived at midnight. Something felt terribly wrong inside. The front door hung open. Blood stained the marble floor. A woman lay quite still. Her eyes stared at nothing. Morgan reached for his flashlight. The beam revealed her face. He recognized the dead woman. She was the wealthy heiress. Footsteps echoed down the hallway. Morgan drew his service weapon. Someone else was still here. The killer had not left.

Evaluation details

Result

Evaluator

Details

Meta Data

100.00%

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