Run: 2026-07-09-01KX41C5EZV8RN74GJB1HX70P8

Run Details

Duration:
9.7s
Cost:
$0.010877
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
95.08% 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 silvered the cemetery gates when Detective Mara Voss discovered a dead magistrate seated beneath the angel statue at dawn. His gloved hands clasped an empty confession while black wax sealed his lips and midnight bells tolled across the city. Mara noticed fresh mud on marble steps although every gate had remained locked since sunset according to the watchman nearby. Inside his pocket, she found a brass key engraved with her own initials, bearing date twenty years before her birth. A whisper moved through the tombs naming Mara's father, whose unsolved disappearance had haunted every official in town for decades. Then the magistrate's corpse sat upright and his sealed mouth opened long enough to speak one impossible name twice softly. Mara recognized the name immediately: it belonged to a witness officially buried beneath that same cemetery thirty years earlier exactly. Before she could question anyone, the cemetery gates slammed shut, trapping three suspects and a fourth unseen presence within the cemetery.
created_at"2026-07-09T18:13:54.79Z" 7/9/2026, 6:13:54 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency8593
moderation_latency(null)
generation_time9413
tokens_prompt46
tokens_completion386
native_tokens_prompt41
native_tokens_completion1806
native_tokens_completion_images0
native_tokens_reasoning1611
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"
service_tier"default"
usage0.010877
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_058877acae17a6c1016a4fe4e2df8c819496ff8577eccb6e07"
is_byokfalse
latency234
model_permaslug"openai/gpt-5.6-luna-20260709"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer(null)
request_id"req-1783620834-qKYHumDoNjjXs8HuTTDa"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783620834-REIFvnCZaVMsgOUwK9Fy"
upstream_id"resp_058877acae17a6c1016a4fe4e2df8c819496ff8577eccb6e07"
total_cost0.010877
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
95.08% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
721