NC Bench
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Run: 2026-02-16-01KHKB1H9ZXT84R98WW69P9KM1
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
40.0s
Cost:
$0.033111
Provider:
OpenAI
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain needled the deserted pier. Detective Quinn adjusted wool collar. Patrol cars glowed beyond tape. The ocean smelled wrong tonight. An officer waved her over. Flashlights combed shadows beneath pilings. A gull screamed, went silent. Body found, Detective, officer called. Mara ducked under the tape. Her shoes splashed through puddles. Wind pushed rain sideways, stinging. The pier groaned like wounded. Underneath, water slapped supports rhythmically. Floodlights painted everything leprous yellow. The victim waited atop crates. Face turned seaward, eyes open. Mara noted expensive ruined coat. No wallet, jewelry, or phone. Rain had washed away blood. But bruises flowered along throat. Ligature marks, narrow and cruel. This wasn't the tide's work. Officer Ramirez hovered nearby, chewing. You called it in, Ramirez? Found by a jogger, ma'am. Jogger's gone home, pretty shaken. Witness statements already taken, useless. Nobody saw anything before storm. Mara crouched, studying the hands. Fingernails clean, no defensive scratches. Whoever killed her knew trust. She looks familiar, Quinn thought. Not from files, something else. Coat label read Harrowgate Club. Expensive place, wrong side town. Ramirez, get membership records tomorrow. Tonight, guard that door personally. He frowned toward bait shack. Somebody might return for something. Behind them, ocean whispered secrets. Above, thunder rolled like drums. Mara straightened, feeling unseen eyes. She turned; pier seemed empty. Somewhere below, phone vibrated faintly. Not the victim's; else waited.
created_at
"2026-02-16T13:43:47.357569+00:00"
2/16/2026, 1:43:47 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4719
moderation_latency
(null)
generation_time
39277
tokens_prompt
46
tokens_completion
1234
native_tokens_prompt
41
native_tokens_completion
3306
native_tokens_completion_images
0
native_tokens_reasoning
2969
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
0.03311125
router
(null)
provider_responses
0
id
"resp_004bdb8ccc1efcd70169931eeae3888193af51d8e75e23d684"
status
200
is_byok
false
latency
169
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771249386-DRLUcwMrBl8X1qKQTmav"
upstream_id
"resp_004bdb8ccc1efcd70169931eeae3888193af51d8e75e23d684"
total_cost
0.03311125
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
45
wordCounts
0
5
1
5
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5
3
5
4
5
5
5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
23
5
24
5
25
5
26
5
27
5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5
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5