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Run: 2026-04-25-01KQ2H3MXWZ6YCH12J53MYDHA2
Run Details
Model:
DeepSeek V4 Pro (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
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
Messages
Meta
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_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
691
moderation_latency
(null)
generation_time
15110
tokens_prompt
46
tokens_completion
750
native_tokens_prompt
39
native_tokens_completion
599
native_tokens_completion_images
(null)
native_tokens_reasoning
104
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.000538095
router
(null)
provider_responses
0
endpoint_id
"d084170b-dd99-4e53-9ae1-b63881f3cfbf"
id
"ffd2018e-c825-4cd0-aa7a-0d8351aed4d5"
is_byok
false
latency
281
model_permaslug
"deepseek/deepseek-v4-pro-20260423"
provider_name
"DeepSeek"
status
200
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_cost
0.000538095
cache_discount
(null)
upstream_inference_cost
0
provider_name
"DeepSeek"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
63.03%
Matches word count
n/a
neededClean
false
sentences
20
wordCounts
0
20
1
19
2
20
3
20
4
21
5
20
6
21
7
21
8
21
9
22
10
20
11
22
12
22
13
21
14
21
15
19
16
20
17
19
18
18
19
19