NC Bench
Overview
About
Tests
Models
Model
Claude Haiku 4.5
Test
N-Length Sentences
Scenario
Write sentences with 10 words each
Run ID
2026-02-08-01KGZ01CF5BKK7MTVC1E6XY1RY
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 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 rain fell hard against the tall Victorian mansion windows. Detective Sarah Chen arrived at midnight with her weathered leather bag. Lord Ashford lay dead upon the Persian rug, quite still. His face was pale, his eyes frozen in eternal fear. A crystal glass of brandy sat beside his cold, lifeless hand. The butler claimed he heard nothing unusual all through the night. But Sarah noticed something odd about the library's mahogany study door. Fresh scratches marked the lock as if picked just hours ago. The victim's will was changed exactly three days before his death. Everyone in the house had secrets, motives, and secrets to hide.
created_at
"2026-02-08T16:06:03.71772+00:00"
Sunday, February 8th, 2026 at 4:06:03 PM GMT+00:00
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2416
moderation_latency
(null)
generation_time
4319
tokens_prompt
35
tokens_completion
137
native_tokens_prompt
44
native_tokens_completion
144
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
0.000764
router
(null)
provider_responses
0
id
"msg_018XdGabh8dTvgevqSDxU5Sj"
status
200
is_byok
false
latency
2416
endpoint_id
"41d2915a-92e6-4993-b537-210b4e10cba8"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770566758-bBlQAwYWfq1RhnflCPk8"
upstream_id
"msg_018XdGabh8dTvgevqSDxU5Sj"
total_cost
0.000764
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
74.4905%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
6
1
10
2
11
3
10
4
10
5
11
6
11
7
11
8
11
9
11
10
11