Run: 2026-02-16-01KHKAYHE0GQRMZT00KTPHP2A6

Run Details

Duration:
40.1s
Cost:
$0.001834
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

AI
The clock in the hall struck midnight as rain hissed against the window and candles trembled in cold neglect there. A violin case lay open on the carpet, its velvet lining stained, secrets fluttering like moths within whispered corridors tonight. From the library stairs, a breath of smoke curled upward, and a body lay draped beneath a painter's lantern dimly. The detective, hooded by night and coffee, moved closer, noting torn pages, an overturned chair, and a single crimson feather. In the moonlit hall, whispers stitched themselves into the wallpaper, accusing shadows of keeping a secret no one uttered there. Outside, thunder rattled the gutted panes, and the city clock chimed twice, as if warning everyone to withhold answers tonight. The corpse wore a smile that did not belong to mourning, as if the kiss of truth numbed every witness. A rainsoaked stair led down to the kitchen, where the butler reported nothing, except the kettle singing a lonesome requiem. On the desk, a letter lay unopened, addressed to someone unnamed, the ink smeared like a map of hidden grievances. The detective drew a breath, determined to trace tremor of fear through rooms, apologies, and doors that refused to close. Somewhere, a violin string twitched, and the manor exhaled, inviting the reader to follow the first footsteps of suspicion tonight.
created_at"2026-02-16T13:42:09.073407+00:00" 2/16/2026, 1:42:09 PM
model"openai/gpt-5-nano-2025-08-07"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3826
moderation_latency(null)
generation_time39852
tokens_prompt46
tokens_completion1529
native_tokens_prompt41
native_tokens_completion4581
native_tokens_completion_images0
native_tokens_reasoning4288
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.00183445
router(null)
provider_responses
0
id"resp_023325c0cf27eccb0169931e88b5e8819095649ce50219cade"
status200
is_byokfalse
latency120
endpoint_id"50329d77-04e1-4979-a184-c33030289476"
provider_name"OpenAI"
model_permaslug"openai/gpt-5-nano-2025-08-07"
api_type"completions"
id"gen-1771249288-y8Ch3KhORQGuNRW1ksNu"
upstream_id"resp_023325c0cf27eccb0169931e88b5e8819095649ce50219cade"
total_cost0.00183445
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.0000% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
020
120
220
320
420
520
620
720
820
920
1020