NC Bench
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Run: 2026-02-16-01KHKATBPG635FQD91AK71EME3
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
22.2s
Cost:
$0.000716
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
Rain hammered the narrow streets as the city woke to whispers about a missing heiress and a buried secret tonight. In the marble lobby of the antique hotel, Detective Mora scanned footprints of fear and the lingering aroma of danger. A bellboy whispered about a victim found at dawn, velvet drapes concealing betrayal, and a clock stubbornly stopping in shadows. Outside, rain slicked the marble steps, reflecting neon advertisements while rumors ricocheted between scarfed mouths and cigarette ashes at midnight. The crime scene lay upstairs, a drawing room arranged as if guests expected to depart, not endure a sudden calamity. Mora listened to a clock, to rain, to sirens distant enough to feel deliberate, and wrote names in anticipation tonight.
created_at
"2026-02-16T13:39:38.562752+00:00"
2/16/2026, 1:39:38 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2497
moderation_latency
(null)
generation_time
21770
tokens_prompt
46
tokens_completion
960
native_tokens_prompt
41
native_tokens_completion
1784
native_tokens_completion_images
0
native_tokens_reasoning
1600
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
0.00071565
router
(null)
provider_responses
0
id
"resp_04a842453b4af7330169931dffc58c8196829933d86d3a6355"
status
200
is_byok
false
latency
110
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771249151-B3Yx15KIEO3Q29AEI1uc"
upstream_id
"resp_04a842453b4af7330169931dffc58c8196829933d86d3a6355"
total_cost
0.00071565
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
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20