Run: 2026-09-29-01M3P2FNQX5C15HNPFMJYW6SCT

Run Details

Model:: Claude Sonnet 5.5 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 10 words each
Duration:: 19.6s
Cost:: $0.025644
Provider:: Claude Platform on AWS

Evaluation summary

Score	Evaluator	Details Link
97.41%	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 Blackthorn Manor's windows while Lord Ashby lay dying.

Nobody heard the shot over thunder, or so they claimed.

Inspector Mara Quill arrived at midnight, soaked and thoroughly unimpressed.

The butler met her at the door, pale as wax.

"His lordship waits in the library, Inspector, though he's dead."

Mara followed him down corridors lined with watching, gilt-framed ancestors.

Inside the library, six suspects sat frozen around the body.

Ashby slumped over his desk, fingers clutching a torn photograph.

Mara knelt, studied the wound, and noticed the unlatched window.

"Someone in this room is lying," she said, and everyone flinched.

Evaluation details

Result

Evaluator

Details

Meta Data

97.41%

Matches word count

n/a

neededClean

false

sentences

wordCounts

0	10
1	10
2	10
3	10
4	10
5	10
6	10
7	10
8	10
9	11