Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYZEEH18N9DFTS6KJNE0P9W

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 hard against the old mansion windows tonight. Detective Sarah Chen stepped out of her unmarked police car. A maid had discovered the body at precisely eight o'clock. Lord Edmund Ashworth lay motionless upon the Persian library carpet. His face was pale, his eyes frozen in final shock. A crystal glass lay shattered beside his outstretched trembling hand. The poison had worked quickly, according to the medical examiner. Everyone in the household claimed they were elsewhere when he died. Sarah pulled out her leather notebook and began taking careful notes. Someone in this mansion had wanted Edmund Ashworth very dead.
created_at"2026-02-08T15:55:41.676171+00:00" Sunday, February 8th, 2026 at 3:55:41 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency700
moderation_latency191
generation_time2360
tokens_prompt35
tokens_completion129
native_tokens_prompt44
native_tokens_completion149
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" 
usage0.000789
router(null)
provider_responses
0
id"3b9c9b1d-8d59-4b67-8378-c687fdff6428" 
status200
is_byokfalse
latency699
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770566138-l6orgxjgYqqRd4HSrTZW" 
upstream_id"3b9c9b1d-8d59-4b67-8378-c687fdff6428" 
total_cost0.000789
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
86.2715% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
110
210
310
410
510
610
710
811
911
1010