Run: 2026-07-09-01KX40K0V2FQHNXTB268CZT7HB

Run Details

Duration:
6.5s
Cost:
$0.006575
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
94.38% 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 a dead violinist beneath the opera house, clutching a crimson envelope freshly sealed with wax. Rain hammered the glass canopy overhead, while distant applause faded through corridors that should have been empty for hours by then. Vale noticed the victim's fingers were stained blue, matching the peculiar ink smeared across every page inside the crimson envelope. A single wet footprint led away from the body, disappearing beneath the locked door of the director's private office upstairs. The director, renowned for charming audiences, had vanished before the final curtain, leaving his silver cane beside the orchestra pit. When Vale opened the envelope, he found a list of four names, including his own, written there in invisible ink. Behind him, the theater doors creaked, and someone whispered, "You should never have returned," before the hallway lights went dark.
created_at"2026-07-09T18:00:10.858Z" 7/9/2026, 6:00:10 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5808
moderation_latency(null)
generation_time6264
tokens_prompt46
tokens_completion239
native_tokens_prompt41
native_tokens_completion1089
native_tokens_completion_images0
native_tokens_reasoning913
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"
usage0.006575
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_028b80d50359e195016a4fe1aaeffc8194886f5cb84ca98fc0"
is_byokfalse
latency206
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-1783620010-dJPa9yg9ruZehxK58dNU"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783620010-aryjNVNNVf7cjmJQysTl"
upstream_id"resp_028b80d50359e195016a4fe1aaeffc8194886f5cb84ca98fc0"
total_cost0.006575
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
94.38% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
020
121
220
320
420
520
620