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Run: 2026-02-16-01KHK9S6FQ1DXS84VSWQM5B6RQ
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
31.4s
Cost:
$0.004794
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 wrapped the harbor like a secret; lamplight trembled against water reflecting a silhouette that would not move later tonight. Detective Mara Cole tasted iron memory as she stepped from taxi; shoes sinking quietly through puddles of rumor and doubt. The victim's door hung open like a promise broken, its hallway breathing secrets between wallpaper and cold birdlight and dust. A coat lay abandoned on the stair, buttons undone like questions; a single glove pointed toward the study and silence. Neighbors murmured on sidewalks, their voices thin as moth wings; someone had heard an argument about money and betrayal tonight. Mara clicked her pen like a metronome, cataloguing alibis, noting stains, listening to lies fold into the house's bones quietly. A child watched from behind lace curtains, thumb in mouth, eyes too old for bedtime; she mouthed name: 'Mr. Hale.'
created_at
"2026-02-16T13:21:37.369694+00:00"
2/16/2026, 1:21:37 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
31073
moderation_latency
(null)
generation_time
31298
tokens_prompt
46
tokens_completion
219
native_tokens_prompt
41
native_tokens_completion
2392
native_tokens_completion_images
0
native_tokens_reasoning
2176
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
0.00479425
router
(null)
provider_responses
0
id
"resp_0e8f7aac3ea65b5101699319c117d0819482c22fc77a2f5f45"
status
200
is_byok
false
latency
143
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771248065-NUdqkoqca4wPzI874rBt"
upstream_id
"resp_0e8f7aac3ea65b5101699319c117d0819482c22fc77a2f5f45"
total_cost
0.00479425
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
82.5816%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
19
7
1