Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 20 words each

Run ID

2026-02-08-01KGYZPBP5GQ7VKJHNC20MWSRP

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

AI
# The Body in the Library Detective Sarah Chen stepped into Ashworth Manor's grand library, her eyes scanning the ornate room carefully. The body of millionaire Edward Ashworth lay sprawled across the Persian rug, blood pooling beneath his head. His personal secretary found him cold this morning while bringing fresh coffee and the day's correspondence. The study door was locked from the inside, with no signs of forced entry or struggle. Three people remained in the house: his wife, his nephew, and the longtime family butler named James. Each had motive, means, and opportunity to commit this most peculiar and baffling of violent crimes. Chen pulled out her leather notebook, knowing that somewhere in this room lay the killer's fatal mistake. The clock struck noon as she began her investigation into Ashworth's death, determined and increasingly suspicious.
created_at"2026-02-08T16:00:01.114399+00:00" Sunday, February 8th, 2026 at 4:00:01 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency917
moderation_latency188
generation_time2677
tokens_prompt35
tokens_completion167
native_tokens_prompt44
native_tokens_completion185
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" 
usage0.000969
router(null)
provider_responses
0
id"24e70973-6771-4975-8e22-06e85630468d" 
status200
is_byokfalse
latency916
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770566397-xhNypQ6tI8f9Lu6CdIyt" 
upstream_id"24e70973-6771-4975-8e22-06e85630468d" 
total_cost0.000969
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
0.3889% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
06
116
217
316
416
517
616
717
816