NC Bench
Overview
About
Tests
Models
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
Messages
Meta
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_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1229
moderation_latency
225
generation_time
7009
tokens_prompt
35
tokens_completion
251
native_tokens_prompt
44
native_tokens_completion
290
native_tokens_completion_images
(null)
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.004482
router
(null)
provider_responses
0
id
"e58baf4b-580d-477f-8bb5-a13b09ea0d1a"
status
200
is_byok
false
latency
1229
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_cost
0.004482
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
58.0095%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
4
1
18
2
19
3
19
4
19
5
19
6
19
7
20
8
20
9
19
10
19