Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYXHRWEHA6QRRV4TJF4P3P9

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
# The Midnight at Ravenswood The storm raged all night. Detective Morgan arrived quite early. A body lay perfectly still. The victim was Lord Ashford. His study door hung open. Blood stained the Persian rug. Nobody heard any screams last night. The family gathered in shock. Morgan examined the crime scene. Footprints led toward the window. The safe stood completely empty. Everyone had secrets to hide. The butler seemed oddly nervous. The daughter refused to speak. His business partner looked guilty. Morgan knew this case. The truth remained well hidden. Someone in this house. Killed Lord Ashford last night.
created_at"2026-02-08T15:22:33.257047+00:00" Sunday, February 8th, 2026 at 3:22:33 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency845
moderation_latency(null)
generation_time2695
tokens_prompt35
tokens_completion126
native_tokens_prompt44
native_tokens_completion139
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" 
usage0.000739
router(null)
provider_responses
0
id"msg_01FF92NKg8pmcSVwfMoUhHt6" 
status200
is_byokfalse
latency812
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770564150-RewoAUCd7WPCR9IkdR9b" 
upstream_id"msg_01FF92NKg8pmcSVwfMoUhHt6" 
total_cost0.000739
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
96.6820% Matches word count n/a
neededCleanfalse
sentences20
wordCounts
05
15
25
35
45
55
65
76
85
95
105
115
125
135
145
155
164
175
184
195