Run: 2026-05-29-01KSSJGPFWH34HEW79QWBDTD2Y

Run Details

Model:: Claude Opus 4.8 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 5 words each
Duration:: 7.7s
Cost:: $0.006700
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 hammered the old windows. Detective Mara entered the room. A body lay there cold. Blood pooled beneath the desk. The clock had stopped ticking. Everyone in town knew him. Mayor Crane was now dead. Mara studied the strange scene. Something felt deeply wrong here. The door was locked tight. No windows had been opened. Yet someone had escaped somehow. She pulled on her gloves. The investigation would begin now. Three guests waited downstairs nervously. One of them was lying. Mara intended to discover who. Outside, the storm grew louder. Inside, secrets would soon surface. This case would test everything.

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
16	5
17	5
18	5
19	5