NC Bench
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Run: 2026-02-16-01KHK9VHMJ9FZ9SV6FV29XH4DD
Run Details
Model:
GPT-5 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
39.1s
Cost:
$0.001074
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 rain battered manor, muting footsteps along marble corridors tonight. Inside, moonlight stitched silver patches across a locked drawing room. A body lay beneath the chandelier, eyes wide with disbelief. The clock chimed three times, each note cruel and deliberate. Detective Mara Hale arrived, coat fluttering, notebook ready for confession. She stepped over velvet rope, surveying footprints and shattered vase. The victim wore a smile that did not belong here. Whispers traveled corners like autumn leaves, confessing nothing, revealing everything. Muffled thunder applauded as suspects gathered, eyes calculating, nerves taut. In her notebook, clues whispered themselves, stubbornly refusing to cooperate. Tonight, the mansion would tell truths it preferred remaining silent. Someone among them wore guilt like perfume, intoxicating and close. The door clicked shut, sealing secrets behind a velvet moon. In stillness, the killer's shadow stretched, watching everyone pretend silently. Only the rain understood the mathematics of motive and misdirection.
created_at
"2026-02-16T13:23:01.342402+00:00"
2/16/2026, 1:23:01 PM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4037
moderation_latency
(null)
generation_time
38891
tokens_prompt
46
tokens_completion
1152
native_tokens_prompt
41
native_tokens_completion
2679
native_tokens_completion_images
0
native_tokens_reasoning
2432
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
0.00107365
router
(null)
provider_responses
0
id
"resp_0ba04bc27a8e1db10169931a0e0b0881908cd10823d2c6219f"
status
200
is_byok
false
latency
109
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771248141-UcjFkspFIOQy7JHjWFZI"
upstream_id
"resp_0ba04bc27a8e1db10169931a0e0b0881908cd10823d2c6219f"
total_cost
0.00107365
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
15
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