Run: 2026-07-09-01KX41K4VDRWVK0DDBC56H447F

Run Details

Duration:
9.1s
Cost:
$0.009917
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
At midnight, Inspector Vale found the mayor facedown beneath the conservatory clock, one hand clutching a bloodstained silver key gleaming. Rain battered the glass roof while every guest gathered outside, insisting they had heard nothing except the clock striking thirteen. Vale noticed muddy footprints leading inward, although the storm had begun after dinner and nobody admitted leaving the ballroom alone. Beside the corpse, a torn invitation displayed tonight’s date, tomorrow’s name, and an accusation of murder written in crimson ink. The message named no culprit, yet its final words made Vale glance toward the silent orchestra balcony above them all. There, a violin string trembled without music, and a single wet footprint darkened the dust beside an empty chair nearby. When the lights failed, someone whispered Vale’s name, and the locked doors opened simultaneously from somewhere inside the house again. By the time candles returned, the mayor’s body had vanished, leaving only the silver key and blood beneath the clock.
created_at"2026-07-09T18:17:43.543Z" 7/9/2026, 6:17:43 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency8337
moderation_latency(null)
generation_time8839
tokens_prompt46
tokens_completion275
native_tokens_prompt41
native_tokens_completion1646
native_tokens_completion_images0
native_tokens_reasoning1445
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"
usage0.009917
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_0a3ffab3218eb4fb016a4fe5c79ff481969f9a3f791bb14546"
is_byokfalse
latency222
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-1783621063-KSCRGng9ma4RsBHPncnA"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783621063-WGt4v79cknK4k5NQjKU2"
upstream_id"resp_0a3ffab3218eb4fb016a4fe5c79ff481969f9a3f791bb14546"
total_cost0.009917
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

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