NC Bench
Overview
About
Tests
Models
Model
Claude Sonnet 4.5
Test
N-Length Sentences
Scenario
Write sentences with 20 words each
Run ID
2026-02-08-01KGZ01YYBQCY1E24EJK8CKK4H
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 Clockmaker's Final Hour The body of Edmund Hargrove lay sprawled across his workshop floor, surrounded by hundreds of ticking clocks on every wall. Detective Sarah Chen stepped carefully over scattered gears and springs, her keen eyes absorbing every detail of the macabre scene before her. Blood pooled beneath the victim's head, mixing with oil from an overturned lamp that had somehow failed to ignite the wooden building. "Time of death approximately midnight," announced the medical examiner, snapping his black bag shut with an air of grim professional efficiency and certainty. Sarah noticed the victim's pocket watch clutched in his right hand, its glass face shattered, the hands frozen at eleven forty-seven. Every clock in the workshop had stopped at that exact moment, as if the whole room had died along with its master. "Could be coincidence," muttered her partner, Detective James Morrison, though his furrowed brow suggested he didn't believe his own casual dismissive words. Sarah knelt beside a workbench where an unfinished clock mechanism lay partially assembled, tiny tools arranged in suspiciously perfect order and precision. A teacup sat on the windowsill, still half full of cold liquid, a faint residue of something chemical coating its porcelain rim. "Get that tested immediately," Sarah instructed a nearby officer, pointing at the cup with her pen while avoiding any direct physical contact. The workshop door had been locked from inside, all windows sealed shut, presenting the impossible puzzle of a completely sealed room murder. Three keys existed for that door: one with the victim, one with his estranged daughter, one with his former business partner and rival. Sarah stood, surveying the frozen moment of violence preserved in this chamber, knowing someone had orchestrated an elaborate and deadly theatrical performance.
created_at
"2026-02-08T16:06:28.018686+00:00"
Sunday, February 8th, 2026 at 4:06:28 PM GMT+00:00
model
"anthropic/claude-4.5-sonnet-20250929"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1426
moderation_latency
170
generation_time
9405
tokens_prompt
35
tokens_completion
355
native_tokens_prompt
44
native_tokens_completion
399
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
0.006117
router
(null)
provider_responses
0
id
"71b8d05e-3075-4cb9-85f9-44f6e5f64a4a"
status
200
is_byok
false
latency
1426
endpoint_id
"d8bee848-f020-454a-b2be-4a7ce868f99f"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-sonnet-20250929"
api_type
"completions"
id
"gen-1770566777-IUSzJsY3Z1GddlEEnuGF"
upstream_id
"71b8d05e-3075-4cb9-85f9-44f6e5f64a4a"
total_cost
0.006117
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
16.9684%
Matches word count
n/a
neededClean
false
sentences
14
wordCounts
0
5
1
20
2
22
3
22
4
23
5
22
6
22
7
22
8
22
9
22
10
22
11
22
12
23
13
22