NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-16-01KHKA94RXVS6F1SWJ6VQQQFDF
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
15.6s
Cost:
$0.000642
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 morning fog curled through alleys like patient suspects awakening. A clock chimed, and the harbor breathed salt and secrets. Detective Mara slipped inside the library where shadows gathered quietly. A body lay outlined in lamplight, peaceful as winter hymn. The crime scene smelled faintly of lilac and old smoke. Footsteps echoed, but no one answered the question haunting her. Her notebook waited, margins inked with theories nobody would admit. Outside, gulls cried verdicts while rain scribbled rumors along windows.
created_at
"2026-02-16T13:30:03.668288+00:00"
2/16/2026, 1:30:03 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
7701
moderation_latency
(null)
generation_time
15458
tokens_prompt
46
tokens_completion
523
native_tokens_prompt
41
native_tokens_completion
1600
native_tokens_completion_images
0
native_tokens_reasoning
1472
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
0.00064205
router
(null)
provider_responses
0
id
"resp_0d77a33cadf3cab40169931bcbafb88193a1b6ccf6d5b9d933"
status
200
is_byok
false
latency
190
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771248587-K0YkUAX8r0LSFR3mFPrI"
upstream_id
"resp_0d77a33cadf3cab40169931bcbafb88193a1b6ccf6d5b9d933"
total_cost
0.00064205
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
8
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10