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Run: 2026-07-09-01KX40RA2S6NNFDGZA5KWN91PD
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.6s
Cost:
$0.008135
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
Messages
Meta
AI
Rain polished the courthouse windows while Detective Mara Voss discovered a dead judge beneath the courthouse portrait depicting blindfolded Justice. His silver gavel rested inside his mouth, and three unfamiliar keys glittered beside one bloodless, outstretched hand, nearby gleaming coldly. No window stood open, yet muddy footprints crossed the chamber, ending abruptly beneath the judge’s locked mahogany desk without explanation. Mara crouched, noticing every print pointed inward, as though the killer had entered from nowhere and vanished into silence again. Behind her, courthouse guards argued softly about missing cameras, while a telephone rang unanswered inside the judge’s coat pocket twice. Then the dead man’s fingers twitched, revealing a narrow strip of paper bearing Mara’s own childhood nickname in faded ink. She read the message once, then looked toward the sealed archives, where someone began turning pages behind the steel door. The guards heard nothing, but Mara heard a whisper through the keyhole: “You promised never to return alive, Detective Voss.”
created_at
"2026-07-09T18:03:04.162Z"
7/9/2026, 6:03:04 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
6046
moderation_latency
(null)
generation_time
6325
tokens_prompt
46
tokens_completion
287
native_tokens_prompt
41
native_tokens_completion
1349
native_tokens_completion_images
0
native_tokens_reasoning
1139
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
service_tier
"default"
usage
0.008135
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_075bf34a378e3afb016a4fe2583aec8195b98bc364a4b1f714"
is_byok
false
latency
188
model_permaslug
"openai/gpt-5.6-luna-20260709"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1783620184-D1e8DdNaTq2tBj0SNkU1"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620184-CrP9mJCr2YPbluptnnLj"
upstream_id
"resp_075bf34a378e3afb016a4fe2583aec8195b98bc364a4b1f714"
total_cost
0.008135
cache_discount
(null)
upstream_inference_cost
0
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
neededClean
false
sentences
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20