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Run: 2026-07-09-01KX418G56NN1BCKHEZ857FXXV
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.4s
Cost:
$0.007199
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
At midnight, Inspector Vale found Lady Ashcombe beneath the library window, her silver mask reflecting the moonlit garden beyond silently. Her right hand gripped a torn playing card, while the locked door behind him whispered of impossible escape and betrayal. Vale knelt, noticing three muddy footprints leading inward, though rain had soaked every path outside the mansion before dawn broke. Behind him, guests gathered silently, each pretending shock while secretly measuring how convincingly everyone else performed innocence under pressure tonight. Then the grandfather clock struck thirteen, and Lady Ashcombe's eyes opened, fixing Vale with unmistakable accusation from beyond death itself. She spoke one word, barely audible: “Marrow,” before her eyes closed beneath the astonished portraits watching from the walls above. Vale rose slowly, understanding that the murderer had chosen the victim, the room, and perhaps even the detective as bait. Outside, thunder rolled across the hills, concealing footsteps that approached the library from an unlit corridor without disturbing anyone nearby.
created_at
"2026-07-09T18:11:54.671Z"
7/9/2026, 6:11:54 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5817
moderation_latency
(null)
generation_time
6188
tokens_prompt
46
tokens_completion
289
native_tokens_prompt
41
native_tokens_completion
1193
native_tokens_completion_images
0
native_tokens_reasoning
989
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
0.007199
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_06dcc26f0eb5a298016a4fe46ac00481958f987c3ff2ecc57f"
is_byok
false
latency
233
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-1783620714-e7bqdd3DsFOIdBsa18i4"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620714-N1BjkmQJoY5iIb1SuRsD"
upstream_id
"resp_06dcc26f0eb5a298016a4fe46ac00481958f987c3ff2ecc57f"
total_cost
0.007199
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