NC Bench
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Run: 2026-02-16-01KHKAVY0EYKP33S6WM570MBC4
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
58.3s
Cost:
$0.002354
Provider:
OpenAI
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 harbor fog clung to the quay as night whispered secrets through half closed lanterns and unseen footsteps beyond gates. A knock shattered stillness, followed by siren lights sighing over timbered warehouses and a body wrapped in rain soaked velvet. Inspector Mirren arrived, cigarette curling blue smoke, noting footprints converging toward a cracked hatch and a glove forgotten ashore nearby. The promenade residents whispered about a vanished alibi, while gulls cried out like witnesses and waves rearranged the docks' secrets. From the victim's pocket, a card slid free, stamped with an address that burned with possible betrayals and merciless debts. A wind tossed envelope fluttered from stairwell, whispering a warning and wresting questions from the shadows that watched around here. He tasted salt on his lips, thought of coerced confessions, and promised to sift every lie from a quiet town. At dawn, the tide would erase footprints, but not the questions haunting those who slept beneath the city’s breath tonight.
created_at
"2026-02-16T13:41:02.17874+00:00"
2/16/2026, 1:41:02 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1924
moderation_latency
(null)
generation_time
58044
tokens_prompt
46
tokens_completion
1410
native_tokens_prompt
41
native_tokens_completion
5879
native_tokens_completion_images
0
native_tokens_reasoning
5632
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
0.00235365
router
(null)
provider_responses
0
id
"resp_09d27052b9ff56e00169931e335fc88195a5b4cb4298da3404"
status
200
is_byok
false
latency
142
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771249203-FyB97NKZneVh9VYq3syH"
upstream_id
"resp_09d27052b9ff56e00169931e335fc88195a5b4cb4298da3404"
total_cost
0.00235365
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20