Model

Claude Sonnet 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYXCT1R5KDNBB1D83JNCS5Q

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 lay sprawled across the marble foyer floor, unmoving. Detective Sarah Chen knelt beside the victim, checking for pulses. Blood pooled beneath his head in a dark crimson circle. The mansion's grandfather clock chimed midnight with echoing, ominous tones. Outside, thunder rumbled while rain lashed against tall gothic windows. Sarah noticed the victim's fingers clutched a torn photograph tightly. She carefully pried it loose, revealing half of someone's face. "Who did this to you?" she whispered to the corpse. Footsteps echoed from the hallway. Someone else was here tonight. Sarah reached for her gun, rising slowly to her feet. A woman in a silk robe appeared, screaming at Sarah. "My husband! Oh God, what happened to my dear husband?" The widow collapsed dramatically, but Sarah noticed something peculiar immediately. There wasn't a single tear falling from the woman's eyes.
created_at"2026-02-08T15:19:54.087665+00:00" Sunday, February 8th, 2026 at 3:19:54 PM GMT+00:00
model"anthropic/claude-4.5-sonnet-20250929" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1895
moderation_latency146
generation_time5340
tokens_prompt35
tokens_completion185
native_tokens_prompt44
native_tokens_completion217
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" 
usage0.003387
router(null)
provider_responses
0
id"dcb70666-aeef-4333-9e4e-08bd15017d57" 
status200
is_byokfalse
latency1894
endpoint_id"d8bee848-f020-454a-b2be-4a7ce868f99f" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-sonnet-20250929" 
api_type"completions" 
id"gen-1770563987-OxB8Y2jqag5mSKpQoB53" 
upstream_id"dcb70666-aeef-4333-9e4e-08bd15017d57" 
total_cost0.003387
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
86.6740% Matches word count n/a
neededCleanfalse
sentences15
wordCounts
010
110
210
310
410
510
610
710
85
95
1010
1110
1210
1310
1410