NC Bench
Overview
About
Tests
Models
Model
Claude Haiku 4.5
Test
N-Length Sentences
Scenario
Write sentences with 20 words each
Run ID
2026-02-08-01KGYXP6YFRXV4Z0D9EB7F8XVE
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 sun filtered through the tall windows of Ashworth Manor, casting long shadows. Detective Sarah Chen stepped out of her unmarked car, noting the grand estate's isolation. Mrs. Eleanor Hartwell lay sprawled across the Persian rug, quite obviously very dead. Blood had pooled beneath her head, suggesting a violent blow from some heavy object. The butler discovered the body at seven o'clock this morning while preparing breakfast. Sarah's keen eyes swept across the room, cataloging every detail with practiced professional attention. Three people had been sleeping in the house throughout the entire previous night. Eleanor's husband Richard stood in the doorway, his face pale with shock and grief. The gardener claimed he saw nothing unusual during his early morning routine outside today. Sarah knew that one of these people had committed this terrible, calculated, premeditated murder.
created_at
"2026-02-08T15:24:58.808584+00:00"
Sunday, February 8th, 2026 at 3:24:58 PM GMT+00:00
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
411
moderation_latency
(null)
generation_time
2609
tokens_prompt
35
tokens_completion
175
native_tokens_prompt
44
native_tokens_completion
184
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
0.000964
router
(null)
provider_responses
0
id
"msg_016PK78FHxqFvu4VQ77J66kH"
status
200
is_byok
false
latency
411
endpoint_id
"41d2915a-92e6-4993-b537-210b4e10cba8"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770564295-WqOKesR5GFSBK0afkwOw"
upstream_id
"msg_016PK78FHxqFvu4VQ77J66kH"
total_cost
0.000964
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
0.0000%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
6
1
14
2
14
3
13
4
14
5
13
6
14
7
13
8
14
9
14
10
14