Run: 2026-07-09-01KX40D4H4MRERWR76PB2A1M1Y

Run Details

Duration:
5.5s
Cost:
$0.005423
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 discovered the mayor's body beneath the conservatory stairs, surrounded by roses that smelled faintly of almonds. Rain tapped the stained glass while seven guests gathered upstairs, each claiming innocence, each hiding something sharper than grief itself. Vale noticed one muddy footprint pointing inward, though every door remained locked and the windows overlooked a sheer cliff below. The victim's pocket watch had stopped at eleven seventeen, precisely when the orchestra downstairs began playing without its conductor present. A crimson thread clung to the mayor's cuff, matching no garment worn by anyone assembled in the candlelit hall nearby. Then the lights failed, and someone whispered Vale's name from inside the locked conservatory, where the dead man waited alone. When illumination returned, the roses had vanished, leaving only damp soil and a silver button beneath the corpse's hand clenched. Vale closed the doors, studied seven frightened faces, and announced that the murderer had remained among them all evening long.
created_at"2026-07-09T17:56:58.029Z" 7/9/2026, 5:56:58 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4538
moderation_latency(null)
generation_time5291
tokens_prompt46
tokens_completion279
native_tokens_prompt41
native_tokens_completion897
native_tokens_completion_images0
native_tokens_reasoning699
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"
usage0.005423
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_0a2ff9966edf0052016a4fe0ea1d588196aa1455c053318d02"
is_byokfalse
latency278
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-1783619818-mfQbyKp50UuhAafNvzxN"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783619818-7ueBIDkIfVRXwGIYmwg3"
upstream_id"resp_0a2ff9966edf0052016a4fe0ea1d588196aa1455c053318d02"
total_cost0.005423
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