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Run: 2026-02-16-01KHKB2PF19SJ5BGJSQFHAVXGX
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
27.1s
Cost:
$0.015451
Provider:
OpenAI
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
Messages
Meta
AI
Rain hammered the boarded windows of Blackthorn House all night. By dawn, the village lane outside lay eerily hushed today. Inspector Mara Kline watched mist curl above the drenched hedges. Her boots sank slightly into mud, swallowing yesterday's delicate bootprints. Those prints belonged to Everett Vale, retired judge and philanthropist. Now Everett lay indoors, motionless, awaiting the coroner's reluctant attention. The front door gaped open, splintered around the heavy lock. No glass broken, no valuables missing, nothing obviously taken whatsoever. Mara ducked inside, tasting copper and lemon from overturned polish. Sunlight pierced dusty air, revealing specks like diligent, silent witnesses. Everett reclined in leather chair, posture absurdly peaceful, horribly final. Crimson stained his collar, seeping downward like ivy across brickwork. Beside him rested untouched tea, still steaming despite the chill. On the mantelpiece, clocks ticked uniformly, insisting nothing was wrong. Mara noticed the painting above Everett, hanging almost imperceptibly crooked. Behind its frame, faint drafts whispered secrets along the wallpaper. From the kitchen came sobs, jagged breaths shredding the silence. Housekeeper Nell Pryce waited there, clutching a towel like bandages. Her gaze fixed on Mara's coat, rainwater slowly dripping crimson.
created_at
"2026-02-16T13:44:13.032021+00:00"
2/16/2026, 1:44:13 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
24979
moderation_latency
(null)
generation_time
27025
tokens_prompt
46
tokens_completion
360
native_tokens_prompt
41
native_tokens_completion
1540
native_tokens_completion_images
0
native_tokens_reasoning
1245
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.01545125
router
(null)
provider_responses
0
id
"resp_00161d8780772b8e0169931f10f3508195bf5d21cfad237f6e"
status
200
is_byok
false
latency
145
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771249424-oIApgoCLln669iipMypA"
upstream_id
"resp_00161d8780772b8e0169931f10f3508195bf5d21cfad237f6e"
total_cost
0.01545125
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Matches word count
n/a
neededClean
false
sentences
19
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10
15
10
16
10
17
10
18
10