NC Bench
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Run: 2026-02-16-01KHKANM83RAQWDSMKNCPPCH1Q
Run Details
Model:
GPT-5
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
32.7s
Cost:
$0.024051
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 stitched the harbor lights into trembling silver threads tonight. Detective Mara Vale watched gulls coil above the boarded pier. The call had dragged her from coffee and unfinished sleep. At Warehouse Twelve, a door hung crooked, breathing salted rot. Inside, footprints smeared rainbow oil across concrete like bruised constellations. A generator coughed, then died, letting shadows settle like ash. Mara lifted caution tape, tasting coppery air that remembered screams. The body lay facedown near crates stenciled with vanished names. A single glove pointed seaward, accusing tides of complicity tonight. Her partner arrived late, humming apologies nobody could truly hear. He flipped the ID card, eyebrows tightening at its photograph. The victim funded charities, and enemies disguised themselves as beneficiaries. Some crates were empty, others groaned softly, padlocks pretending diligence. Rain thickened, drumming clues into puddles that refused translation tonight. Mara photographed everything, but the scene photographed her instead back. A whistle blew distant, precise, like someone counting down options. She pocketed the glove, feeling threads rasp secrets against skin. Somewhere above, a camera blinked, swallowing evidence with polite hunger. The harbor clock tolled four, sounding tender, almost apologizing softly. Mara whispered names, and the dark answered with one back.
created_at
"2026-02-16T13:37:10.19243+00:00"
2/16/2026, 1:37:10 PM
model
"openai/gpt-5-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
30217
moderation_latency
(null)
generation_time
32517
tokens_prompt
46
tokens_completion
364
native_tokens_prompt
41
native_tokens_completion
2400
native_tokens_completion_images
0
native_tokens_reasoning
2112
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
0.02405125
router
(null)
provider_responses
0
id
"resp_0baf84827e010b450169931d64b73081939301521e6cbdcdea"
status
200
is_byok
false
latency
176
endpoint_id
"7c2f859a-7890-4e8e-b1de-1cd1c0a800b4"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-2025-08-07"
api_type
"completions"
id
"gen-1771248996-QLZsLfRSDGkWCZpQzG5Q"
upstream_id
"resp_0baf84827e010b450169931d64b73081939301521e6cbdcdea"
total_cost
0.02405125
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
20
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
19
10