Run: 2026-09-23-01M37Q186WV0BNFRPPPPFQ8HPY

Run Details

Model:: Claude Opus 5.5 (Reasoning)
Test:: N-Length Sentences
Scenario:: Write sentences with 5 words each
Duration:: 15.1s
Cost:: $0.021348
Provider:: Claude Platform on AWS

Evaluation summary

Score	Evaluator	Details Link
90.91%	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 manor. Thunder rolled across dark hills. Inside, the grandfather clock stopped. Lady Ashford screamed from upstairs. Everyone rushed toward the library. The heavy door stood open. Lord Ashford lay facedown, motionless. A silver dagger gleamed nearby. Blood pooled across Persian rugs. The butler dropped his candle. Nobody spoke for several seconds.

Then Inspector Graves stepped forward. He studied the room carefully. "Nobody leaves this house tonight." The guests exchanged nervous glances. Someone among them was lying. The window remained firmly locked. Strange muddy footprints led nowhere. Graves knelt beside the body. A crumpled note lay hidden. It bore a single sentence. "You are all guilty here." Lightning flashed across the glass. The clock began ticking again.

Evaluation details

Result

Evaluator

Details

Meta Data

90.91%

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	10
14	5
15	5
16	5
17	5
18	5
19	5
20	10
21	5