Run: 2026-07-09-01KX41EP5NVPT1E1YFHQ1GQ7TK

Run Details

Duration:
1.4s
Cost:
$0.000803
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
57.54% 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 hammered Blackthorn Manor as Detective Mara Voss arrived, summoned by a bloodstained letter discovered beneath the victim’s pillow. Inside, the grandfather clock had stopped at midnight, while seven guests waited silently around the library’s locked doors. Lord Adrian Vale lay beneath the chandelier, clutching a silver key and wearing someone else’s wedding ring on his finger. Mara noticed fresh mud across the carpet, leading away from the corpse and disappearing beneath the curtains behind the bookcase. “None of you leaves,” she announced, before thunder cracked and every candle extinguished simultaneously throughout the ancient house.
created_at"2026-07-09T18:15:17.438Z" 7/9/2026, 6:15:17 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency380
moderation_latency(null)
generation_time1050
tokens_prompt46
tokens_completion171
native_tokens_prompt41
native_tokens_completion127
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"
usage0.000803
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_0e20f92a66b8696e016a4fe535846c8190aaeec70ce6f1b37f"
is_byokfalse
latency219
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-1783620917-xOsbXbbXRJHIj9iFffFd"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783620917-ySQzHOIXIxKHnA8Wviif"
upstream_id"resp_0e20f92a66b8696e016a4fe535846c8190aaeec70ce6f1b37f"
total_cost0.000803
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
57.54% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
019
118
220
320
418