Run: 2026-03-18-01KM0AE43VHEQ71RR4DTKBM8M3

Run Details

Duration:
2.5s
Cost:
$0.000249
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
3.94% Matches word count (details)

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 rain tapped quietly outside Marrowick House as guests gathered for winter dinner, unaware of tonight's missing heirloom. Beneath gaslit ceilings, Detective Elara Voss watched servants hurry, noting every whisper, every glance, every trembling hand tonight. Sir Alden’s portrait still hung above the fireplace, while his signet ring vanished from the display case. When guests laughed too loudly, Elara asked for silence, then examined footprints leading from study to cellar. Mrs. Harrow, trembling in lace, swore she last saw the ring near midnight, before storm swallowed lanterns. From the cellar stair, a faint smell of almonds rose, promising poison, or simply unfamiliar perfume tonight. Elara found a torn glove by the stone steps, stitched with initials matching none of them. The butler insisted doors stayed locked, yet a keyhole scrape gleamed, fresh as yesterday’s secrets.
created_at"2026-03-18T11:14:01.99Z" 3/18/2026, 11:14:01 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency433
moderation_latency(null)
generation_time2425
tokens_prompt46
tokens_completion233
native_tokens_prompt41
native_tokens_completion193
native_tokens_completion_images0
native_tokens_reasoning0
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"
usage0.00024945
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0bb102490cded0ba0169ba88fa0be08197b3f9340fcb5c7457"
is_byokfalse
latency171
model_permaslug"openai/gpt-5.4-nano-20260317"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer(null)
api_type"completions"
id"gen-1773832441-PWb9TxB02uyutkcnlW9h"
upstream_id"resp_0bb102490cded0ba0169ba88fa0be08197b3f9340fcb5c7457"
total_cost0.00024945
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
3.94% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
018
118
217
317
417
517
616
715