NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-09-10-01M25DZ57TB1FGPAG948FWFER7
Run Details
Model:
DeepSeek V4.1 Flash (Reasoning, High)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
16.7s
Cost:
$0.002531
Provider:
DeepSeek
Evaluation summary
Score
Evaluator
Details Link
100.00%
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 rain hammered the windshield as Detective Mara Voss quietly parked outside the crumbling Victorian mansion on Blackthorn Hill tonight. A single light burned upstairs, and the front door swayed open like a dark mouth waiting invitingly for her there. Inside, the grandfather clock had stopped at midnight, its pendulum frozen above a body sprawled across the bloody Persian rug. The victim lay with eyes open, staring at the ceiling as if reading a final silent accusation written in dust. A shattered wine glass glittered beside the corpse, and crimson drops led toward the shadowed hallway beyond the open doorway. Mara stepped forward, her breath fogging the cold air, while her hand slowly drifted toward the holster at her side. Somewhere above, a floorboard creaked, proving the killer had not fled but waited, watching her every move in patient silence. She whispered, "Show yourself," and the mansion answered with a low, grinding laugh somewhere from deep within its ancient walls.
created_at
"2026-09-10T10:31:43.614Z"
9/10/2026, 10:31:43 AM
model
"deepseek/deepseek-v4.1-flash-20260910"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
492
moderation_latency
(null)
generation_time
16688
tokens_prompt
46
tokens_completion
4142
native_tokens_prompt
65
native_tokens_completion
4202
native_tokens_completion_images
(null)
native_tokens_reasoning
4005
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"
service_tier
(null)
usage
0.00253095
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer
(null)
request_id
"req-1789036303-Ki1WPZllLx6R0yKmGGrM"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1789036303-Ds1mQ5yEl3d7V0VkOb54"
upstream_id
"25b89e18-9127-442d-a0a0-50dde5bc97e2"
provider_responses
0
endpoint_id
"fd104bc8-535a-4d31-a847-a8e402e86a02"
id
"25b89e18-9127-442d-a0a0-50dde5bc97e2"
is_byok
false
latency
339
model_permaslug
"deepseek/deepseek-v4.1-flash-20260910"
provider_name
"DeepSeek"
status
200
total_cost
0.00253095
cache_discount
(null)
upstream_inference_cost
0
provider_name
"DeepSeek"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20