Model

Claude Sonnet 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYWXMSZWQ9WM6ZM2KWDSD6K

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 ancient grandfather clock struck midnight in the shadowy manor. Detective Sarah Chen studied the body sprawled on marble floors. Blood pooled beneath Lord Ashford's head like dark crimson silk. His eyes stared upward with frozen terror and terrible surprise. The murder weapon, a silver candlestick, lay nearby on carpet. Eight dinner guests remained trapped inside during the raging snowstorm. One among them had killed their host just hours earlier. Sarah noticed the broken glass near the victim's outstretched fingers. A torn piece of fabric clung to his cold hand. Outside, wind howled through bare trees like mournful desperate ghosts. The killer was still here, watching, waiting, hiding in shadows.
created_at"2026-02-08T15:11:37.382645+00:00" Sunday, February 8th, 2026 at 3:11:37 PM GMT+00:00
model"anthropic/claude-4.5-sonnet-20250929" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2035
moderation_latency230
generation_time5787
tokens_prompt35
tokens_completion140
native_tokens_prompt44
native_tokens_completion164
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" 
usage0.002592
router(null)
provider_responses
0
id"c4c647f4-7f84-4bec-a525-aa3b349dadb9" 
status200
is_byokfalse
latency2034
endpoint_id"d8bee848-f020-454a-b2be-4a7ce868f99f" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-sonnet-20250929" 
api_type"completions" 
id"gen-1770563490-EIEK1oNiUrYvRrvScmh7" 
upstream_id"c4c647f4-7f84-4bec-a525-aa3b349dadb9" 
total_cost0.002592
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
100.0000% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
010
110
210
310
410
510
610
710
810
910
1010