NC Bench
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Run: 2026-02-16-01KHKAFX7DW6AXNXDYQPMZX568
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
27.8s
Cost:
$0.006212
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
Fog hugged the crooked alley where lanterns sputtered and neighbors gathered, whispering about blood darkening the cobblestones before midnight's bell. Detective Marlowe arrived, coat collar turned up, mud on his boots, eyes already cataloging secrets the town preferred to hide. A woman's hand lay pale and elegant beneath a shawl, ringed fingers unclenched, palm stained with someone else's perfume tonight. Neighbors argued quietly about alibis and resentments, pointing at the butcher's son with trembling fingers and furious eyes that evening. Flowers left at the doorstep wilted under rain, petals blackened like old secrets, names whispered into the damp air slowly. Marlowe crouched, studying a thin footprint in the mud, cigarette ash falling like an accusation into the earth with intent. He noticed an embroidery thread snagged on the sleeve nearby, blue silk glinting, a clue obvious and infuriatingly private again. Somebody in the crowd watched Marlowe too closely, jaw clenched, eyes flicking like sparrows toward an unspoken confession and waiting. Rain tapered to a hush, and the town held its breath while a bell tolled once, twice, demanding answers loudly.
created_at
"2026-02-16T13:33:57.370286+00:00"
2/16/2026, 1:33:57 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2450
moderation_latency
(null)
generation_time
27418
tokens_prompt
46
tokens_completion
1111
native_tokens_prompt
41
native_tokens_completion
3101
native_tokens_completion_images
0
native_tokens_reasoning
2816
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
0.00621225
router
(null)
provider_responses
0
id
"resp_0954e617c97b537d0169931ca9483c8197841e9a83b92f389b"
status
200
is_byok
false
latency
117
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771248809-4gP23FxUQ6vwKDaisSPF"
upstream_id
"resp_0954e617c97b537d0169931ca9483c8197841e9a83b92f389b"
total_cost
0.00621225
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
9
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20