Run: 2026-04-24-01KQ0NZ12FB8NQ3VTYTCWVC54E

Run Details

Duration:
18.4s
Cost:
$0.033955
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 needled the windows of Blackthorne Hall as Inspector Vale arrived, summoned by a telegram bearing no signature tonight whatsoever. Inside, the guests stood frozen around Lord Blackthorne, whose blood darkened the library carpet like spilled burgundy beneath their shoes. A silver letter opener jutted from his throat, pinning a lace cravat against skin already whitening under the yellow lamplight. No one claimed to hear a cry, though the storm had not yet broken above the moors that cold evening. Vale noticed muddy footprints crossing the hearth, then stopping precisely before the portrait of Blackthorne's first wife in mourning silks. Beside the corpse, a stopped pocket watch ticked once, impossibly, when Vale touched the shattered crystal with gloved fingertips lightly. Lady Blackthorne smiled faintly at that sound, and every candle in the room seemed to lean toward her pale face. Then the butler whispered that one guest was missing, and the locked conservatory smelled strongly of roses and old gunpowder.
created_at"2026-04-24T21:22:35.733Z" 4/24/2026, 9:22:35 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency17702
moderation_latency(null)
generation_time18053
tokens_prompt46
tokens_completion533
native_tokens_prompt41
native_tokens_completion1125
native_tokens_completion_images0
native_tokens_reasoning915
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.033955
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0cdea24c57da382f0169ebdf1bd8508190afb09bc5b85398c4"
is_byokfalse
latency257
model_permaslug"openai/gpt-5.5-20260423"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777065755-IBF81lE2I9Hz0uCb4Zau"
session_id(null)
api_type"completions"
id"gen-1777065755-ru7pqk8OKCCXJZu2sQIs"
upstream_id"resp_0cdea24c57da382f0169ebdf1bd8508190afb09bc5b85398c4"
total_cost0.033955
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

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