Run: 2026-07-09-01KX404Y32XBSS56A9SXNQHPNV

Run Details

Duration:
1.5s
Cost:
$0.000971
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
72.47% 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 battered Blackthorn Manor as Detective Mara Venn discovered Lord Ashcombe dead beside the library’s shattered grandfather clock. His silver pocket watch had stopped at midnight, though every clock elsewhere insisted the hour was twelve minutes past. Mara noticed muddy footprints crossing the carpet, yet none approached the corpse, and one print pointed toward the locked window. Behind the curtains, she found a single black feather pinned neatly to the frame with Lord Ashcombe’s jeweled tiepin. The butler, trembling nearby, claimed nobody entered, but Mara saw fresh blood beneath his immaculate fingernails and quietly said nothing. Then someone upstairs screamed, and the manor’s lights vanished, leaving Mara alone with the dead man, the feather, and darkness.
created_at"2026-07-09T17:52:29.292Z" 7/9/2026, 5:52:29 PM
model"openai/gpt-5.6-luna-20260709"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency377
moderation_latency(null)
generation_time1201
tokens_prompt46
tokens_completion202
native_tokens_prompt41
native_tokens_completion155
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"
usage0.000971
router(null)
provider_responses
0
endpoint_id"eebea444-34a5-4642-a766-cb319471d33a"
id"resp_08f4d1e90d20927c016a4fdfdd61108193972a723156d45fd6"
is_byokfalse
latency266
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-1783619549-q8Dyr7GLVKm2C2ScSBvz"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1783619549-JgSUrbWIkEpuT9virZdz"
upstream_id"resp_08f4d1e90d20927c016a4fdfdd61108193972a723156d45fd6"
total_cost0.000971
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
72.47% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
018
119
220
319
420
520