NC Bench
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Run: 2026-02-16-01KHKANG2Q6W2MTKNY097T518P
Run Details
Model:
GPT-5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
44.7s
Cost:
$0.026841
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 old boardinghouse as the power failed, leaving hallways breathing shadows and secrets in rhythmic darkness all night. Detective Mara Quinn arrived late, umbrella useless, drawn by a whispering call reporting thumps, arguments, and finally silence upstairs tonight. The caretaker met her barefoot, candle trembling, saying Mrs. Vale retired early, though everyone heard footsteps pacing after midnight downstairs. In Room Nine, damp wallpaper curled like peeling hands, and the window latch wore scratches arranged like pleading constellations outside. On the bed lay Mrs. Vale, throat bruised, eyes fixed beyond the ceiling, as if studying an approaching storm alone. A wine glass waited on the dresser, lipstick smudged twice, beside a single earring and threadbare Bible opened accusingly there. Mara kneeled, noticing faint ash on the carpet, like grey constellations pointing from the door toward the motionless hand beneath. Somewhere below, a clock stuttered thirteen, then twelve, a miscount echoed by plumbing groans and a muffled sob from somewhere. The caretaker prayed quickly, but Mara traced condensation on the mirror, revealing letters scrawled backwards: meet me downstairs at once. Lightning flared, and the corridor filled with neighbors, faces pale as unbaked clay, each insisting the others never left tonight.
created_at
"2026-02-16T13:37:17.511506+00:00"
2/16/2026, 1:37:17 PM
model
"openai/gpt-5-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4017
moderation_latency
(null)
generation_time
44414
tokens_prompt
46
tokens_completion
932
native_tokens_prompt
41
native_tokens_completion
2679
native_tokens_completion_images
0
native_tokens_reasoning
2368
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
0.02684125
router
(null)
provider_responses
0
id
"resp_01aa3b7f6eff134b0169931d606e7c8195a0d2c5de57072378"
status
200
is_byok
false
latency
156
endpoint_id
"7c2f859a-7890-4e8e-b1de-1cd1c0a800b4"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-2025-08-07"
api_type
"completions"
id
"gen-1771248992-UvpSwuOPthVERdL1Odru"
upstream_id
"resp_01aa3b7f6eff134b0169931d606e7c8195a0d2c5de57072378"
total_cost
0.02684125
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
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20