Run: 2026-05-29-01KSSJS9YMYFBDYDYWNEDWQH9X

Run Details

Model:: Claude Opus 4.8 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 5 words each
Duration:: 7.3s
Cost:: $0.008750
Provider:: Anthropic

Evaluation summary

Score	Evaluator	Details Link
98.30%	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 old mansion. Detective Cole stepped through doorways. The body lay face-down. Blood pooled across marble floors. Candles flickered in the darkness. Someone had been here recently. A scream echoed upstairs suddenly. Cole drew his service weapon. Five guests remained inside tonight. One of them was lying. The grandfather clock struck midnight. Shadows danced along the walls. Cole knelt beside the victim. Her eyes stared at nothing. A single rose lay nearby. Its petals were stained crimson. This murder felt strangely personal. The killer knew this house. Every exit had been locked. Nobody could have escaped easily. Cole studied the dead woman. Her hand clutched torn paper. Three words were written there. "Trust nobody here tonight," it read. Thunder shook the entire estate. The investigation had truly begun.

Evaluation details

Result

Evaluator

Details

Meta Data

98.30%

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	5
12	5
13	5
14	5
15	5
16	5
17	5
18	5
19	5
20	5
21	5
22	5
23	6
24	5
25	5