Run: 2026-09-29-01M3P2CNVS2X38NYAKYCNV0R5F

Run Details

Model:: Claude Sonnet 5.5 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 10 words each
Duration:: 17.3s
Cost:: $0.025854
Provider:: Claude Platform on AWS

Evaluation summary

Score	Evaluator	Details Link
88.89%	Matches word count	(details)

Model input

User/Human

Please write the opening scene of a murder mystery where each sentence has exactly 10 words.
Please make sure that each sentence has the same length. Only return the opening itself.

Model response

Rain hammered the windows of Blackwood Manor that October night. Inside the library, twelve guests sipped sherry and avoided conversation. Lord Ashcombe stood by the fireplace, tapping his glass twice. "I have gathered you tonight to reveal a terrible secret." Then every lamp in the house flickered and abruptly died. Somebody screamed, glass shattered, and footsteps thundered across the floorboards. When the lights returned, Ashcombe lay dead on the rug. A silver letter opener protruded from his back, still gleaming. Detective Quinn, a reluctant guest, knelt to check his pulse. "Nobody leaves," she whispered, "because the killer is among you."

Evaluation details

Result

Evaluator

Details

Meta Data

88.89%

Matches word count

n/a

neededClean

false

sentences

wordCounts

0	10
1	10
2	10
3	20
4	10
5	10
6	10
7	10
8	10