Run: 2026-04-25-01KQ2H3MXWZ6YCH12J53MYDHA2

Run Details

Duration:
17.1s
Cost:
$0.000538
Provider:
DeepSeek

Evaluation summary

Score Evaluator
Details Link
63.03% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The old mansion loomed against the bruised evening sky, its windows like vacant, watchful eyes patiently observing the winding driveway. Detective Harding pulled his collar tight, feeling the damp autumn air seep through his woolen coat with relentless persistence. A single yellow bulb flickered above the massive oak door, casting nervous shadows that danced across the weathered stone steps. He raised the heavy iron knocker and let it fall three times, the sound echoing deep within the silent house. No one answered, so he pushed the door open and stepped into a grand foyer thick with the scent of decay. Rain began to drum softly on the roof, a melancholy rhythm that matched the slow thudding of his anxious heart. A grandfather clock stood frozen at midnight, its pendulum stilled, as if time itself had abandoned this forsaken place long ago. He noticed a single wine glass on the marble floor, a dark ruby stain drying beneath its shattered, elegant crystal stem. A woman’s silk scarf lay crumpled nearby, its delicate fabric snagged and torn as though wrenched away in sudden, desperate violence. He knelt carefully, lifting the scarf with gloved fingers, catching the faint ghost of expensive perfume still clinging hopefully to the threads. A creaking floorboard from somewhere upstairs shattered the heavy silence, sending a sharp jolt of adrenaline straight through his veins. He called out into the oppressive darkness, but only the house answered with the low groan of settling timber and ancient sorrow. Following the sound, he climbed the spiral staircase, each step a whispered protest beneath the worn soles of his polished leather shoes. The upstairs hallway stretched before him like a dark throat, lined with closed doors hiding terrible secrets in their gloomy recesses. One door stood slightly ajar, a thin sliver of lamplight spilling out and painting a pale stripe across the dusty floorboards. He approached quietly, his breath held tight, and nudged the door open with trembling, cautious fingertips ready for anything. The room was a study, its walls lined with leather-bound books that had long since surrendered to creeping black mold. A large mahogany desk sat in the center, its surface cluttered with papers and a brass lamp burning low. Behind the desk, sprawled unnaturally in a high-backed chair, sat the body of a man with sightless eyes. His starched white shirtfront was drenched crimson, a single perfect rose placed mockingly across his still and silent chest.
created_at"2026-04-25T14:36:15.053Z" 4/25/2026, 2:36:15 PM
model"deepseek/deepseek-v4-pro-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency691
moderation_latency(null)
generation_time15110
tokens_prompt46
tokens_completion750
native_tokens_prompt39
native_tokens_completion599
native_tokens_completion_images(null)
native_tokens_reasoning104
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
usage0.000538095
router(null)
provider_responses
0
endpoint_id"d084170b-dd99-4e53-9ae1-b63881f3cfbf"
id"ffd2018e-c825-4cd0-aa7a-0d8351aed4d5"
is_byokfalse
latency281
model_permaslug"deepseek/deepseek-v4-pro-20260423"
provider_name"DeepSeek"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777127775-0ea8nhJUxdywZTOFPmkM"
session_id(null)
api_type"completions"
id"gen-1777127775-43GL7pkIXu55Q14omGTR"
upstream_id"ffd2018e-c825-4cd0-aa7a-0d8351aed4d5"
total_cost0.000538095
cache_discount(null)
upstream_inference_cost0
provider_name"DeepSeek"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
63.03% Matches word count n/a
neededCleanfalse
sentences20
wordCounts
020
119
220
320
421
520
621
721
821
922
1020
1122
1222
1321
1421
1519
1620
1719
1818
1919