NC Bench
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Run: 2026-02-16-01KHKA10DFKP05DWPERYBCSM6W
Run Details
Model:
GPT-5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 21s
Cost:
$0.030571
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 iron rooftops while the town clock tolled midnight, swallowing footsteps echoing along the abandoned quay inwardly cold. Detective Mara Quin stepped from the ferry, coat heavy with brine, notebook ready, doubts prowling like patient strays around her. Harbor lamps shivered in the wind, scattering gold shards across puddles that mirrored broken windows and darker, watchful corners everywhere. The call had promised routine, yet the constable's voice carried sandpaper edges, hiding something uglier than simple trouble that night. Inside Warehouse Nine, ropes dangled like dead vines, and gulls quarrelled above rafters crusted with salt, feathers, and suspicion everywhere. The body waited among overturned crates, face veiled by netting, fingers stained sapphire, as if grasping night and drowning slowly. A lantern bobbed near the pier doors, revealing constable Hale, hat crushed, eyes refusing to meet Mara's steady gaze directly. He muttered about accidents and fishhooks, but his trembling thumbs counted, miscounted, then hid, rehearsing guilt without confession for hours. Mara peeled the net aside, and the mouth seemed to whisper seawater, delivering silence that foamed against unspoken names ashore. Beneath the jawline, a narrow puncture bled rust, not crimson, ringed with powdery glitter that clung like treacherous frost everywhere. She lifted a small enamel token from the victim's palm, a lighthouse emblem scratched by careful, furious strokes last night. Outside, the ferry moaned again, and distant laughter skittered across water, bright as glass, already beginning to fracture into shards.
created_at
"2026-02-16T13:26:42.57882+00:00"
2/16/2026, 1:26:42 PM
model
"openai/gpt-5-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
57878
moderation_latency
(null)
generation_time
80840
tokens_prompt
46
tokens_completion
1079
native_tokens_prompt
41
native_tokens_completion
3052
native_tokens_completion_images
0
native_tokens_reasoning
2688
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
0.03057125
router
(null)
provider_responses
0
id
"resp_059147352f389b000169931ac10e948195872de58e272ea109"
status
200
is_byok
false
latency
185
endpoint_id
"7c2f859a-7890-4e8e-b1de-1cd1c0a800b4"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-2025-08-07"
api_type
"completions"
id
"gen-1771248320-v1Oq76K8r7KKaBxP4FCu"
upstream_id
"resp_059147352f389b000169931ac10e948195872de58e272ea109"
total_cost
0.03057125
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
12
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20
10
20
11
20