NC Bench
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Run: 2026-02-16-01KHKAWQ3KPYBQHWM9B7TKM0Z8
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
22.3s
Cost:
$0.000920
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
Rain hammered marble streets as the city woke to whispers. In the alley, a body lay beneath flickering neon signs. Detective Mara Vance arrived, coat collar turned against rain tonight. Her notebook trembled as sirens approached without any mercy nearby. The victim wore a smile carved by fear and secrets. A single cigarette burned in his fingers, still smoldering softly. Vance surveyed the scene, noting lipstick prints and muddy footprints. Somewhere, a clock chimed three times, slicing through night air. The city seemed innocent, yet every shadow whispered motive hidden. Mara pocketed a photograph, a clue begging careful, relentless pursuit. Footsteps echoed behind her, allies or enemies awaiting the reveal. Some viewers whispered about a secret in the victim's past. The case would test loyalties, courage, and every careful alibi. Night pressed closer, staining the alley with possibilities and danger.
created_at
"2026-02-16T13:40:51.528843+00:00"
2/16/2026, 1:40:51 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1837
moderation_latency
(null)
generation_time
22062
tokens_prompt
46
tokens_completion
928
native_tokens_prompt
41
native_tokens_completion
2294
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
0.00091965
router
(null)
provider_responses
0
id
"resp_0ed42d7bfd15838e0169931e4d00888197baea2e8d4a3f6c6e"
status
200
is_byok
false
latency
115
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771249228-hWFJcNZTFxxEvg29JZVk"
upstream_id
"resp_0ed42d7bfd15838e0169931e4d00888197baea2e8d4a3f6c6e"
total_cost
0.00091965
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
14
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