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

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_id182717
external_user(null)
streamedtrue
cancelledfalse
latency563
moderation_latency157
generation_time1990
tokens_prompt35
tokens_completion133
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"f611ff87-387e-40b7-a305-1423bb8ea617" 
status200
is_byokfalse
latency562
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_cost0.000819
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
88.6277% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
110
210
310
411
510
610
710
810
910
1010