NC Bench
Overview
About
Tests
Models
Model
Claude Haiku 4.5
Test
N-Length Sentences
Scenario
Write sentences with 10 words each
Run ID
2026-02-08-01KGYY8C4R5J0DZPZD1XCH9FV9
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 heavily on the quiet English countryside tonight. Detective Inspector Morrison arrived at Blackthorn Manor just after midnight. Lady Ashworth's body lay cold upon the Persian library rug. Her pearl necklace glimmered in the lamplight above her face. The butler discovered her unconscious, then realized she was quite dead. A crystal glass lay shattered beside her outstretched trembling right hand. The local constable had already cordoned off the entire manor library. Three household staff members waited nervously in the drawing room downstairs. Each one had motive, opportunity, and secrets they desperately wished hidden. Morrison surveyed the scene carefully, knowing the killer was very close.
created_at
"2026-02-08T15:34:53.980366+00:00"
Sunday, February 8th, 2026 at 3:34:53 PM GMT+00:00
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
789
moderation_latency
201
generation_time
2562
tokens_prompt
35
tokens_completion
140
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
"4fae8222-becc-4d4f-9e2c-5a1ade2abe20"
status
200
is_byok
false
latency
789
endpoint_id
"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770564890-EWMHxeDGzkv362ovUahb"
upstream_id
"4fae8222-becc-4d4f-9e2c-5a1ade2abe20"
total_cost
0.000819
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
76.8467%
Matches word count
n/a
neededClean
false
sentences
11
wordCounts
0
6
1
10
2
10
3
10
4
10
5
11
6
11
7
11
8
11
9
11
10
11