Run: 2026-03-09-01KKAC3T4PZWWVA8JV4KAY30ZB

Run Details

Duration:
16.3s
Cost:
$0.015447
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
100.00% 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 polished the manor windows while mourners gathered below, whispering through black veils as midnight settled over the family crypt. When the clock struck twelve, Lady Verity Ashcombe descended the staircase smiling faintly, one gloved hand closed around a telegram. No one noticed the butler freezing beside the portrait gallery, except me, because I had already seen the blood there. It streaked the marble banister like a signature, fresh and bright, ending beneath the matriarch's locked bedroom door upstairs tonight. Before anyone screamed, the lights failed, and somewhere above us a woman laughed once, sharply, then stopped forever in darkness. By the time candles arrived, Lady Verity lay dead beside the telegram, and every face in the hall had changed. The message, still clutched between her fingers, contained seven words only: I know what happened there that night last summer. I introduced myself to the inspector then, though privately I feared his questions less than the answers waiting upstairs alone.
created_at"2026-03-09T22:40:03.742Z" 3/9/2026, 10:40:03 PM
model"openai/gpt-5.4-20260305"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency14444
moderation_latency(null)
generation_time16159
tokens_prompt46
tokens_completion262
native_tokens_prompt41
native_tokens_completion1023
native_tokens_completion_images0
native_tokens_reasoning816
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"
usage0.0154475
router(null)
provider_responses
0
endpoint_id"9ff5625c-403f-4d7f-b895-58ac7295062c"
id"resp_081d2ada962352bf0169af4c43cc888194a5b5881eb99c4008"
is_byokfalse
latency141
model_permaslug"openai/gpt-5.4-20260305"
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-1773096003-3OgdrF8umx19y0ZFwj1A"
upstream_id"resp_081d2ada962352bf0169af4c43cc888194a5b5881eb99c4008"
total_cost0.0154475
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
720