Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYZWHZCMF6122YMD20VBEFP

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 heavily on the old mansion that night. Detective Sarah Chen arrived at the scene just after midnight. Lord Ashford lay dead upon the Persian rug in blood. His butler had discovered the body while making the rounds. Everyone in the house was now a suspect, she thought. The study door had been locked from the inside all along. Sarah examined the wound carefully, noting its precise and surgical nature. "Who had access to the study during the evening hours?" she asked. The family gathered in the drawing room, their faces pale and shocked. Nobody wanted to admit they had heard anything at all.
created_at"2026-02-08T16:03:23.523349+00:00" Sunday, February 8th, 2026 at 4:03:23 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency512
moderation_latency154
generation_time2097
tokens_prompt35
tokens_completion130
native_tokens_prompt44
native_tokens_completion134
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" 
usage0.000714
router(null)
provider_responses
0
id"376f0553-9f04-4e64-be59-08947801881d" 
status200
is_byokfalse
latency511
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770566600-HUomhufQev7GYqGmQE0c" 
upstream_id"376f0553-9f04-4e64-be59-08947801881d" 
total_cost0.000714
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
73.5660% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
110
210
310
410
510
611
711
812
912
1010