NC Bench
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Run: 2026-02-16-01KHKAA6G3K1BTCR6248ZR6ZCQ
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
35.7s
Cost:
$0.001186
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
Rain hammered the cobblestones as midnight bells tolled, signaling secrets hiding behind respectable doors and polished smiles within the manor. Inspectress Mara Lane arrived, rainwater pelting her coat, already noting footprints leading toward the library and a silent, accusing clock. In the library, a body lay sprawled beneath towering portraits, a dagger glinting, and whispers fluttered like disturbed moths everywhere. A telegram lay unopened on the desk, postmarked in a city that never slept, hinting at debts, vows, and betrayal. Mara kneeled, inspecting the wound on the victim's throat while a clock chimed, counting seconds that refused to lie tonight. From the rainwashed window, a cat stared, tail flicking, as if guarding someone else's secrets while the storm intensified outside. The manor breathed with chandeliers, muffled footsteps, and unanswered questions, as Mara vowed to unravel the night’s carefully staged alibi.
created_at
"2026-02-16T13:30:58.124396+00:00"
2/16/2026, 1:30:58 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3224
moderation_latency
(null)
generation_time
35194
tokens_prompt
46
tokens_completion
992
native_tokens_prompt
41
native_tokens_completion
2960
native_tokens_completion_images
0
native_tokens_reasoning
2752
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
0.00118605
router
(null)
provider_responses
0
id
"resp_08135bd9ab67e2360169931bee287c8195a205f1721a0d26e9"
status
200
is_byok
false
latency
116
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771248622-SxCerEAgdE2FIm6pnkhM"
upstream_id
"resp_08135bd9ab67e2360169931bee287c8195a205f1721a0d26e9"
total_cost
0.00118605
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20