Run: 2026-07-09-01KX40CN1RY80728NKXRE90CX7

Run Details

Duration:
2.1s
Cost:
$0.000785
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
49.67% 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 polished the courthouse windows while Detective Mara Voss discovered Judge Bellwether's body beneath the chandelier, clutching a blue button. Everyone gathered inside insisted the locked courtroom had remained empty, though muddy footprints crossed the aisle toward the judge's vacant bench. Mara noticed eight witnesses watching her carefully, each wearing identical blue buttons sewn beneath their collars, like concealed evidence. Then the courthouse clock struck midnight, and Judge Bellwether's dead hand slowly pointed toward the youngest witness present. Nobody spoke until the lights vanished, leaving Mara alone with the corpse, eight suspects, and footsteps circling overhead.
created_at"2026-07-09T17:56:42.176Z" 7/9/2026, 5:56:42 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency378
moderation_latency(null)
generation_time2049
tokens_prompt46
tokens_completion180
native_tokens_prompt41
native_tokens_completion124
native_tokens_completion_images0
native_tokens_reasoning0
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"
usage0.000785
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_028a52b186ab7100016a4fe0da3f908194b1e01cbfb2fc6eef"
is_byokfalse
latency249
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-1783619802-yYpBrKvHaG7qxCl5sLc0"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783619802-mKBPBLFfhdB0PS9ollmO"
upstream_id"resp_028a52b186ab7100016a4fe0da3f908194b1e01cbfb2fc6eef"
total_cost0.000785
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
49.67% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
020
121
219
318
418