Run: 2026-03-18-01KM0ADRZK5YZYRBZZ3MQGPE5V

Run Details

Duration:
1.5s
Cost:
$0.000282
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
0.23% 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
Night settled over Marrowick Harbor, and gulls circled silently above the fog-choked pier where secrets waited. Detective Eliana Voss arrived at dawn, drawn by a corpse found beside the old lighthouse steps, still. Fishermen whispered that Captain Hargrove quarreled yesterday, yet no one mentioned the missing ledger kept. The victim lay sprawled face down, pockets turned out, and a peculiar silver key gleamed beside him. Eliana knelt carefully, noticing saltwater droplets on glassy eyes, as if something watched. Behind her, Inspector Marr argued with the coroner about time of death and motive. A storm lantern flickered near the body, illuminating footprints leading inward toward closed warehouses. Eliana read a torn note clutched in Hargrove’s hand, promising payment, then silence. When she unfolded it, ink bore three initials, but the last letter had been deliberately scratched. From the warehouse, a music box began playing, soft and tinny, like a warning.
created_at"2026-03-18T11:13:50.592Z" 3/18/2026, 11:13:50 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency460
moderation_latency(null)
generation_time1269
tokens_prompt46
tokens_completion255
native_tokens_prompt41
native_tokens_completion219
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"
usage0.00028195
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_04798f344fe934cb0169ba88eea6808196a9bdb09a70cb07f5"
is_byokfalse
latency201
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-1773832430-rC2j9z8Ib3SU9RAjVNkU"
upstream_id"resp_04798f344fe934cb0169ba88eea6808196a9bdb09a70cb07f5"
total_cost0.00028195
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
0.23% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
016
117
215
317
413
514
614
713
816
914