Run: 2026-03-18-01KM0ATR9Q0JKD0SWNY3412FCK

Run Details

Duration:
1.5s
Cost:
$0.000242
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
3.68% 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
Detective Mara Ellison arrived at Briarwood Manor as the rain stopped, yet fear lingered along corridors. The butler insisted Sir Aldren died peacefully, though a clockwork bird lay shattered near the conservatory window. Guests gathered around the lamplit foyer, arguing softly over alibis, while candle smoke twisted like secrets. From her pocket, Mara produced gloves and a notebook, noting muddy footprints ending abruptly beside a rug. A maid whispered that someone had locked the library door from outside, then vanished before midnight. In the study, she found ink-spattered letters, a missing vial, and a knife still wet with something dark. Inspector Havel frowned, mentioning the will's draft, and pointed toward a bloodless scratch on the desk. Mara knelt near the bird pieces, noticing a gold key etched with initials, not belonging to Sir Aldren.
created_at"2026-03-18T11:20:55.875Z" 3/18/2026, 11:20:55 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency481
moderation_latency(null)
generation_time1271
tokens_prompt46
tokens_completion224
native_tokens_prompt41
native_tokens_completion187
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"
usage0.00024195
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0516c77138091ed80169ba8a97f33c8194871156ec670c19e9"
is_byokfalse
latency210
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-1773832855-FX54ARFTD8bLEXQdShF5"
upstream_id"resp_0516c77138091ed80169ba8a97f33c8194871156ec670c19e9"
total_cost0.00024195
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
3.68% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
016
117
216
317
416
518
616
718