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Run: 2026-07-09-01KX404Y32XBSS56A9SXNQHPNV
Run Details
Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
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
Messages
Meta
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_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
377
moderation_latency
(null)
generation_time
1201
tokens_prompt
46
tokens_completion
202
native_tokens_prompt
41
native_tokens_completion
155
native_tokens_completion_images
0
native_tokens_reasoning
0
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
0.000971
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_08f4d1e90d20927c016a4fdfdd61108193972a723156d45fd6"
is_byok
false
latency
266
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-1783619549-q8Dyr7GLVKm2C2ScSBvz"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783619549-JgSUrbWIkEpuT9virZdz"
upstream_id
"resp_08f4d1e90d20927c016a4fdfdd61108193972a723156d45fd6"
total_cost
0.000971
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
72.47%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
18
1
19
2
20
3
19
4
20
5
20