NC Bench
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Run: 2026-02-16-01KHK99HCNKTY74E1J34F5WVMW
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
21.9s
Cost:
$0.004472
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
A single white shoe lay abandoned beneath the gaslamp tonight. Detective Marlowe arrived with rain darkening his tweed shoulders again. She lay on cobbles, eyes open, mouth whispering unspoken secrets. A bloodstain mapped a slow and terrible cartography across pavement. Neighbors gathered like curious moths arranged around the lamplight quietly. Someone had scrawled a name on the doorstep, hurriedly tonight. Footprints led away, muddy prints vanishing toward the river bridge. The postman swore he heard shouting, then a stifled scream. Clocktower chimed three; witnesses glanced at wrists, unwillingly confessing time. In the alley, a crimson handprint outlined a final clue.
created_at
"2026-02-16T13:12:54.184727+00:00"
2/16/2026, 1:12:54 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2334
moderation_latency
(null)
generation_time
21711
tokens_prompt
46
tokens_completion
832
native_tokens_prompt
41
native_tokens_completion
2231
native_tokens_completion_images
0
native_tokens_reasoning
2048
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
0.00447225
router
(null)
provider_responses
0
id
"resp_0be27af9fa8fec0101699317bffc00819693d6b7e5c4c868a2"
status
200
is_byok
false
latency
56
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771247551-UjkLud4o7lWXm2lWPhp3"
upstream_id
"resp_0be27af9fa8fec0101699317bffc00819693d6b7e5c4c868a2"
total_cost
0.00447225
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
10
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10