Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYXRSX9A8MD8H1CHESKFXP6

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 Detective Sarah Chen arrived at the old mansion early morning. The victim lay sprawled across the Persian rug, quite dead. His name was Victor Ashford, wealthy and widely despised locally. Sarah counted exactly seven people present in the grand foyer. Each suspect wore an expression mixing shock with guilty fear. The butler discovered the body at precisely six o'clock. Nobody had left the house since the dinner party. The storm outside had knocked down trees and power. Sarah's notebook lay ready as she began her investigation. One of these seven people had committed this terrible crime.
created_at"2026-02-08T15:26:23.470349+00:00" Sunday, February 8th, 2026 at 3:26:23 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency465
moderation_latency(null)
generation_time2507
tokens_prompt35
tokens_completion122
native_tokens_prompt44
native_tokens_completion127
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" 
usage0.000679
router(null)
provider_responses
0
id"msg_018NNJFFdPAAmM5SLrEof8ce" 
status200
is_byokfalse
latency465
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770564380-ImNqZ0PXfGuAY2iJLzHR" 
upstream_id"msg_018NNJFFdPAAmM5SLrEof8ce" 
total_cost0.000679
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
81.5591% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
110
210
310
410
510
69
79
89
99
1010