NC Bench
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Run: 2026-02-16-01KHK9YQGNDZQCW2TYXWFSRFXF
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
36.2s
Cost:
$0.001206
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
The harbor fog clung to cobblestones as lanterns trembled tonight. A bell tolled somewhere unseen, calling secrets from sleeping alleys. In the pale doorway, violin case rested, breathless and mute. A newspaper flapped on a railing, announcing yesterday's impossible resolve. Somebody whispered names, but none claimed guilt beneath the clock. Light spilled from a window, painting suspects with amber hesitation. A clock in the hall sighed, marking unwelcome, inevitable arrival. The victim lay not far, elegant, pale, and judging quietly. Someone had arranged lilies around the body like quiet witnesses. I am Detective Lark, and this harbor keeps watchful secrets. Tonight, every shadow will confess before the morning's iron rules. Rain began softly, tapping stories against glass like anxious fingers. From the balcony, a silhouette watched, calculating whom night protected. Every breath tasted of rain, tobacco, and unspoken accusations tonight. This is how murder begins: with fog, doors, and names. The scene breathes, inviting questions, promising that answers will sting. And somewhere, someone rehearses alibis while the harbor holds breath.
created_at
"2026-02-16T13:24:42.963383+00:00"
2/16/2026, 1:24:42 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3989
moderation_latency
(null)
generation_time
35953
tokens_prompt
46
tokens_completion
1150
native_tokens_prompt
41
native_tokens_completion
3011
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
0.00120645
router
(null)
provider_responses
0
id
"resp_02a7f210156915480169931a765fc48190bf6936512486d3a6"
status
200
is_byok
false
latency
107
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771248246-0o08xiAO2XlFOsg2nD7z"
upstream_id
"resp_02a7f210156915480169931a765fc48190bf6936512486d3a6"
total_cost
0.00120645
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
17
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10
15
10
16
10