Run: 2026-03-18-01KM07FW0T275T06DY8900RT9B

Run Details

Duration:
1.4s
Cost:
$0.000256
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
0.26% 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 old mansion loomed over foggy cliffs as Detective Mara Voss arrived, summoned by frantic coastal townsfolk. Inside, servants whispered of sudden thunder, and every clock chimed wrong, marking minutes that refused to align. At the foyer, a body lay near the marble stairs, dressed neatly, yet eyes staring elsewhere. The victim, Sir Alton Mercer, held a shattered pocketwatch, its hands frozen between betrayal and prayer. Mara knelt beside him, noting salt stains, vanished candles, and a crimson ribbon pinned to linen. Constable Price insisted the lock was sealed, though seawind scratched windows from the stormy north. A maid named Elsie begged silence, swearing she heard violin music behind locked study doors. From that study, smoke curled upward, though no flame burned, and the air smelled metallic. Mara asked everyone to recount their hours, while the tide tapped rhythms against the stained glass.
created_at"2026-03-18T10:22:33.514Z" 3/18/2026, 10:22:33 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency490
moderation_latency(null)
generation_time1260
tokens_prompt46
tokens_completion239
native_tokens_prompt41
native_tokens_completion198
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"
usage0.0002557
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0181e77130c288d10169ba7ce996f08196ba320557136e226b"
is_byokfalse
latency214
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-1773829353-IsBvZBxuPMBiZDoBluxH"
upstream_id"resp_0181e77130c288d10169ba7ce996f08196ba320557136e226b"
total_cost0.0002557
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
0.26% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
017
117
216
316
416
515
615
715
816