Run: 2026-03-18-01KM0AKZAS9EJFNE0X3CNHTSJV

Run Details

Duration:
1.5s
Cost:
$0.000266
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
3.38% 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
Rain tapped the courthouse windows as Detective Mara Ellery studied a corpse beneath gaslight, silent courtroom murmurs fading. A judge requested immediate answers, claiming the victim vanished nightly from his chambers, then returned dead at dawn. On the marble floor, a torn glove lay beside a ticking pocket watch, stopped precisely at 3:17. Witnesses swore he argued with Councilman Varric yesterday, then laughed, yet none heard threats. Mara noted ink smears on the watchchain, matching blue stains from the defendant's desk blotter. The Councilman wore polished grief, offering condolences while avoiding every question about travel permits. Mara inhaled, then lifted the glove carefully, finding a hotel keycard stamped with her own name. The coroner whispered poison, but Mara saw no needle marks, only a thin ring of chalk dust. From the gallery, a violinist fled, knocking over seating, and swore the murderer wore a white scarf.
created_at"2026-03-18T11:17:13.702Z" 3/18/2026, 11:17:13 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency454
moderation_latency(null)
generation_time1335
tokens_prompt46
tokens_completion245
native_tokens_prompt41
native_tokens_completion206
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"
usage0.0002657
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0cbede442ac052da0169ba89b9c1c88195b0eeec292df812fa"
is_byokfalse
latency192
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-1773832633-0QIuO0VEoTcDHQmjYUyG"
upstream_id"resp_0cbede442ac052da0169ba89b9c1c88195b0eeec292df812fa"
total_cost0.0002657
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
3.38% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
018
118
217
314
415
514
616
717
817