Model

Claude Sonnet 4.5

Test

N-Length Sentences

Scenario

Write sentences with 20 words each

Run ID

2026-02-08-01KGYYJYE0XRY6Q21JP2BTY1YT

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
# The Midnight Garden The body lay beneath the rose arbor, pale moonlight casting shadows across features frozen in eternal, silent surprise. Detective Sarah Chen knelt beside the victim, her gloved hands carefully examining evidence while thunder rumbled ominously overhead tonight. "Time of death approximately two hours ago," the medical examiner murmured, adjusting his glasses with fingers that trembled slightly. Blood had pooled beneath the woman's silk evening gown, the crimson stain spreading outward like some grotesque, blooming flower. Sarah noticed the victim's emerald necklace was missing, though the clasp remained intact, suggesting the killer knew her well. "Her name is Victoria Ashworth," Officer Martinez reported, consulting his notepad under the dim glow of his trembling flashlight. The renowned philanthropist had been hosting her annual charity gala when she disappeared from the crowded ballroom without explanation earlier. Fifty guests remained inside the manor, each claiming ignorance, each harboring secrets, each potentially guilty of this calculated crime tonight. Sarah stood slowly, her keen eyes scanning the garden path for footprints, finding only carefully raked gravel and confusion. A single white camellia lay clutched in Victoria's hand, its petals unstained, its presence inexplicable, its meaning yet unknown.
created_at"2026-02-08T15:40:45.261803+00:00" Sunday, February 8th, 2026 at 3:40:45 PM GMT+00:00
model"anthropic/claude-4.5-sonnet-20250929" 
app_id182717
external_user(null)
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cancelledfalse
latency1229
moderation_latency225
generation_time7009
tokens_prompt35
tokens_completion251
native_tokens_prompt44
native_tokens_completion290
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/" 
is_byokfalse
finish_reason"stop" 
native_finish_reason"stop" 
usage0.004482
router(null)
provider_responses
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id"e58baf4b-580d-477f-8bb5-a13b09ea0d1a" 
status200
is_byokfalse
latency1229
endpoint_id"d8bee848-f020-454a-b2be-4a7ce868f99f" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-sonnet-20250929" 
api_type"completions" 
id"gen-1770565237-LdzCMIPsYXsHA4M3pHQh" 
upstream_id"e58baf4b-580d-477f-8bb5-a13b09ea0d1a" 
total_cost0.004482
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
58.0095% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
04
118
219
319
419
519
619
720
820
919
1019