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Run: 2026-09-10-01M25DY8RQK230H21D54EVYBVF
Run Details
Model:
DeepSeek V4.1 Flash (Reasoning, High)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
16.0s
Cost:
$0.002736
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
Rain hammered the cracked window as Detective Mara Voss quietly stepped alone into the abandoned lighthouse at very cold midnight. A dead body lay beneath the spiral staircase, its hand clutching a brass key near shattered glass and old blood. Mara knelt beside the victim, noticing a silver locket, wet footprints, and a strange symbol deeply carved into old floorboards. The locket opened with a soft click, revealing a tiny photograph of the mayor's missing daughter from twelve years ago. Outside, waves crashed against jagged rocks while a distant foghorn moaned through the haunted stormy darkness like a wounded animal. Mara heard footsteps above her, slow and deliberate, followed by the creak of an opening door somewhere in the lighthouse. She drew her weapon, rising carefully, her eyes fixed on the shadow moving across the ceiling above the old stairs. Then the lights died, plunging the lighthouse into very cold blackness, and a voice softly whispered her name from below. Mara turned toward the sound, knowing the killer had been patiently waiting for her all along in the dark shadows. The first shot suddenly rang out before she could even scream, and the dark mystery ended before it truly began.
created_at
"2026-09-10T10:31:14.459Z"
9/10/2026, 10:31:14 AM
model
"deepseek/deepseek-v4.1-flash-20260910"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
494
moderation_latency
(null)
generation_time
15920
tokens_prompt
46
tokens_completion
4417
native_tokens_prompt
65
native_tokens_completion
4544
native_tokens_completion_images
(null)
native_tokens_reasoning
4306
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
0.00273615
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer
(null)
request_id
"req-1789036274-iCAUfmOp5ZzhLsq2v2PH"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1789036274-vLyGTGSRPGk7pBGmGL7w"
upstream_id
"1226586a-0d20-4e35-bccc-4c8e02b09954"
provider_responses
0
endpoint_id
"fd104bc8-535a-4d31-a847-a8e402e86a02"
id
"1226586a-0d20-4e35-bccc-4c8e02b09954"
is_byok
false
latency
336
model_permaslug
"deepseek/deepseek-v4.1-flash-20260910"
provider_name
"DeepSeek"
status
200
total_cost
0.00273615
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
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20