Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGZ01CF5BKK7MTVC1E6XY1RY

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 tall Victorian mansion windows. Detective Sarah Chen arrived at midnight with her weathered leather bag. Lord Ashford lay dead upon the Persian rug, quite still. His face was pale, his eyes frozen in eternal fear. A crystal glass of brandy sat beside his cold, lifeless hand. The butler claimed he heard nothing unusual all through the night. But Sarah noticed something odd about the library's mahogany study door. Fresh scratches marked the lock as if picked just hours ago. The victim's will was changed exactly three days before his death. Everyone in the house had secrets, motives, and secrets to hide.
created_at"2026-02-08T16:06:03.71772+00:00" Sunday, February 8th, 2026 at 4:06:03 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2416
moderation_latency(null)
generation_time4319
tokens_prompt35
tokens_completion137
native_tokens_prompt44
native_tokens_completion144
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" 
usage0.000764
router(null)
provider_responses
0
id"msg_018XdGabh8dTvgevqSDxU5Sj" 
status200
is_byokfalse
latency2416
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770566758-bBlQAwYWfq1RhnflCPk8" 
upstream_id"msg_018XdGabh8dTvgevqSDxU5Sj" 
total_cost0.000764
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
74.4905% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
110
211
310
410
511
611
711
811
911
1011