NC Bench
Overview
About
Tests
Models
Model
Claude Haiku 4.5
Test
N-Length Sentences
Scenario
Write sentences with 10 words each
Run ID
2026-02-08-01KGYX0PANXBFDSZ66TYFN1J59
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 old mansion windows tonight. Detective Sarah Chen stepped out of her unmarked police car. A butler stood waiting at the entrance looking visibly shaken. "The body is upstairs in the east wing library," he said. Sarah climbed the grand staircase, her footsteps echoing through halls. The study door was open, revealing a gruesome scene inside. Lord Pemberton lay sprawled across his mahogany desk, quite dead. A letter opener protruded from between his shoulder blades deeply. His face was frozen in an expression of pure shock. Sarah pulled out her notebook, ready to begin her investigation.
created_at
"2026-02-08T15:13:13.329171+00:00"
Sunday, February 8th, 2026 at 3:13:13 PM GMT+00:00
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
563
moderation_latency
157
generation_time
1990
tokens_prompt
35
tokens_completion
133
native_tokens_prompt
44
native_tokens_completion
155
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
0.000819
router
(null)
provider_responses
0
id
"f611ff87-387e-40b7-a305-1423bb8ea617"
status
200
is_byok
false
latency
562
endpoint_id
"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770563590-p08X1Oe8e0GB12C7KeOd"
upstream_id
"f611ff87-387e-40b7-a305-1423bb8ea617"
total_cost
0.000819
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
88.6277%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
6
1
10
2
10
3
10
4
11
5
10
6
10
7
10
8
10
9
10
10
10