Run: 2026-02-16-01KHKAGEPPH1GQ1DC8W61CFV2E

Run Details

Duration:
35.8s
Cost:
$0.001344
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 town awoke beneath pale dawn, and the old observatory loomed like a watchful sentinel above rumors tonight and fears. Detective Mara Lenz arrived with rain on her coat, following whispers that something crooked had fractured the morning before breakfast. Inside, the circular chamber hummed with quiet electricity, as if the telescope sighed after centuries of silence and starlight breath. On the console lay a chalkboard with numbers, and beneath it, a body draped in a velvet cloak and silence. The clock ticked irregularly, each echo a question, as if time itself hesitated before unveiling the killer's motive to justice. From the hallway, a librarian whispered about forged alibis and a vanished map rumored to reveal the thief that night. Outside, the wind hissed through broken panes, carrying a scent of sulfur and old coins from forgotten safes in basements. A note scrawled in chalk read that the truth hides where light cannot shine, and the room listened in silence. Mara stepped closer, tracing dust on the telescope mount, noting footprints leading toward the fogged glass and nothing else there.
created_at"2026-02-16T13:34:23.60708+00:00" 2/16/2026, 1:34:23 PM
model"openai/gpt-5-nano-2025-08-07"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3298
moderation_latency(null)
generation_time34928
tokens_prompt46
tokens_completion1100
native_tokens_prompt41
native_tokens_completion3355
native_tokens_completion_images0
native_tokens_reasoning3072
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"
usage0.00134405
router(null)
provider_responses
0
id"resp_01d0be231d05ecdb0169931cbb3630819784a193ec1a3b78d4"
status200
is_byokfalse
latency126
endpoint_id"50329d77-04e1-4979-a184-c33030289476"
provider_name"OpenAI"
model_permaslug"openai/gpt-5-nano-2025-08-07"
api_type"completions"
id"gen-1771248827-oQcMDA0bkb6MZMgbJ6qA"
upstream_id"resp_01d0be231d05ecdb0169931cbb3630819784a193ec1a3b78d4"
total_cost0.00134405
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.0000% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
020
120
220
320
420
520
620
720
820