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

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_id182717
external_user(null)
streamedtrue
cancelledfalse
latency789
moderation_latency201
generation_time2562
tokens_prompt35
tokens_completion140
native_tokens_prompt44
native_tokens_completion155
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/" 
is_byokfalse
finish_reason"stop" 
native_finish_reason"stop" 
usage0.000819
router(null)
provider_responses
0
id"4fae8222-becc-4d4f-9e2c-5a1ade2abe20" 
status200
is_byokfalse
latency789
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_cost0.000819
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
76.8467% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
110
210
310
410
511
611
711
811
911
1011