NC Bench
Overview
About
Tests
Models
Model
Claude Haiku 4.5
Test
N-Length Sentences
Scenario
Write sentences with 20 words each
Run ID
2026-02-08-01KGYZPBP5GQ7VKJHNC20MWSRP
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 Body in the Library Detective Sarah Chen stepped into Ashworth Manor's grand library, her eyes scanning the ornate room carefully. The body of millionaire Edward Ashworth lay sprawled across the Persian rug, blood pooling beneath his head. His personal secretary found him cold this morning while bringing fresh coffee and the day's correspondence. The study door was locked from the inside, with no signs of forced entry or struggle. Three people remained in the house: his wife, his nephew, and the longtime family butler named James. Each had motive, means, and opportunity to commit this most peculiar and baffling of violent crimes. Chen pulled out her leather notebook, knowing that somewhere in this room lay the killer's fatal mistake. The clock struck noon as she began her investigation into Ashworth's death, determined and increasingly suspicious.
created_at
"2026-02-08T16:00:01.114399+00:00"
Sunday, February 8th, 2026 at 4:00:01 PM GMT+00:00
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
917
moderation_latency
188
generation_time
2677
tokens_prompt
35
tokens_completion
167
native_tokens_prompt
44
native_tokens_completion
185
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
0.000969
router
(null)
provider_responses
0
id
"24e70973-6771-4975-8e22-06e85630468d"
status
200
is_byok
false
latency
916
endpoint_id
"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770566397-xhNypQ6tI8f9Lu6CdIyt"
upstream_id
"24e70973-6771-4975-8e22-06e85630468d"
total_cost
0.000969
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
0.3889%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
6
1
16
2
17
3
16
4
16
5
17
6
16
7
17
8
16