NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-02-08-01KGYXQG360YE5AB5HYFB63B9S
Run Details
Model:
Claude Haiku 4.5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
2.8s
Cost:
$0.000859
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
0.00%
Matches word count
(details)
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 The morning fog clung to Blackwood Manor like a shroud as Detective Sarah Chen arrived. Lady Margaret's body lay motionless across the mahogany desk in her private study downstairs. Her silk nightgown was torn and blood stained the Persian rug beneath her still form. The butler had discovered her at half past seven while opening the curtains for daylight. Every window and door in the study had been locked from the inside when found. Sarah's eyes narrowed as she examined the room, counting five suspects in the drawing room. Someone in this house had committed murder, and the killer was undoubtedly still here somewhere. The storm last night had blocked the only road out, trapping everyone within these stone walls.
created_at
"2026-02-08T15:25:41.113619+00:00"
2/8/2026, 3:25:41 PM
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
576
moderation_latency
(null)
generation_time
2581
tokens_prompt
35
tokens_completion
148
native_tokens_prompt
44
native_tokens_completion
163
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
0.000859
router
(null)
provider_responses
0
id
"msg_01Ef6DtmpphUi7cJPFNF6ZHa"
status
200
is_byok
false
latency
576
endpoint_id
"41d2915a-92e6-4993-b537-210b4e10cba8"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770564337-p5ksZf0ZGSOg4VX7cDpI"
upstream_id
"msg_01Ef6DtmpphUi7cJPFNF6ZHa"
total_cost
0.000859
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
0.00%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
6
1
15
2
14
3
15
4
15
5
15
6
15
7
15
8
16