Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGZ03D7WVZDMDZ4KT6MD6PSW

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 at Blackthorn Manor The morning fog clung heavily to Blackthorn Manor's grounds. Sarah discovered the body while walking through the garden. Lord Ashford lay motionless beneath the ancient oak tree. His face was pale; his eyes stared at nothing. The gardener's shears protruded from between his ribs clearly. Sarah's scream echoed across the misty grounds of silence. Within minutes, servants came running from every direction quickly. Police would arrive soon to investigate this terrible crime. Everyone at the manor now became a suspect instantly. Nobody knew who wanted Lord Ashford dead so badly.
created_at"2026-02-08T16:07:08.135059+00:00" Sunday, February 8th, 2026 at 4:07:08 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency675
moderation_latency188
generation_time2085
tokens_prompt35
tokens_completion121
native_tokens_prompt44
native_tokens_completion137
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" 
usage0.000729
router(null)
provider_responses
0
id"257df9db-e2b7-400e-8ce4-f5665287dead" 
status200
is_byokfalse
latency674
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770566825-Q5x9Ah4KaCl7WKSgsOjh" 
upstream_id"257df9db-e2b7-400e-8ce4-f5665287dead" 
total_cost0.000729
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
67.4219% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
19
29
39
49
59
69
79
89
99
109