Run: 2026-04-24-01KQ0N9SA721AW45SD47JP4E66

Run Details

Duration:
14.3s
Cost:
$0.028555
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 Blackthorn Manor while Inspector Vale studied the corpse beside the grandfather clock at midnight alone. Lady Aurelia stood rigid in silk, her pearl necklace broken, scattering moons across the blood-dark parquet beneath her trembling feet. The butler claimed he heard nothing, though thunder had paused precisely when the library door slammed shut behind someone unseen. On the mantel, a chessboard waited midgame, its white king tipped over like a fainting witness in accusing silence tonight. Vale noticed muddy footprints crossing the Turkish rug, then vanishing before the locked conservatory doors as if swallowed completely there. A coal fire hissed softly, releasing a smell of roses, brandy, and something bitter underneath that made witnesses pale simultaneously. When the village constable lifted the victim's hand, a silver cufflink rolled into the light, engraved with Aurelia's crest clearly. Before anyone spoke, the clock struck one, and every face in the room confessed fear, except the dead man's own.
created_at"2026-04-24T21:10:59.668Z" 4/24/2026, 9:10:59 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency13558
moderation_latency(null)
generation_time13975
tokens_prompt46
tokens_completion518
native_tokens_prompt41
native_tokens_completion945
native_tokens_completion_images0
native_tokens_reasoning740
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"
usage0.028555
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_041cca3b7b3bb9290169ebdc63cc2481948b52af032f93803a"
is_byokfalse
latency312
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-1777065059-OvPnEgiUeeBjM225ghEN"
session_id(null)
api_type"completions"
id"gen-1777065059-xZJpDPNKKWqnwP3cj4uS"
upstream_id"resp_041cca3b7b3bb9290169ebdc63cc2481948b52af032f93803a"
total_cost0.028555
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