NC Bench
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Run: 2026-02-16-01KHK96T2F9AET993PMW2G476M
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
28.3s
Cost:
$0.001110
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 licked the harbor as lanterns trembled, and the town woke to rumors thicker than the morning mist and shadows. At the docks, Mae Carver unrolled a map, counting footprints, listening for breaths that never reached the surface that night. The pier's edge glowed with slick rain, and a violin case lay open, revealing silence instead of strings, waiting nearby. From the alley, a streetlamp flickered, casting a halo around a chalk outline and a single wilted rose on cement. Mae knew every case began with noise and hesitation, not confession, and this one hummed with unanswered questions from everywhere. A distant bell tolled twice, as gulls wheeled above, and the town pressed closer, hungry for certainty and spectacle tonight. A rumor claimed the victim wore someone else's name, a confession hidden beneath linen collars and smiling photographs at home. Mae folded the map, sealed the case in her mind, and stepped into dawn's cold breath to begin the work.
created_at
"2026-02-16T13:11:31.585201+00:00"
2/16/2026, 1:11:31 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4260
moderation_latency
(null)
generation_time
28104
tokens_prompt
46
tokens_completion
1068
native_tokens_prompt
41
native_tokens_completion
2770
native_tokens_completion_images
0
native_tokens_reasoning
2560
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
0.00111005
router
(null)
provider_responses
0
id
"resp_05101e0ccfa512f401699317668ed08195baad91ccc8856d02"
status
200
is_byok
false
latency
155
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771247462-xD38G5TpMTsEVBw6xAOq"
upstream_id
"resp_05101e0ccfa512f401699317668ed08195baad91ccc8856d02"
total_cost
0.00111005
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
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20