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Run: 2026-07-09-01KX41FECY3ZSPH0F0VHTQHC15
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
11.7s
Cost:
$0.007457
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 stitched silver lines across Blackthorn Manor, while Inspector Vale watched the library window glow beneath the midnight storm outside. Inside, someone had arranged three wineglasses beside the corpse, though only two guests remained awake downstairs in the house tonight. Vale entered cautiously, silently noticing muddy footprints circling the body before disappearing beneath an antique Persian rug near the fireplace. The dead man clutched a torn playing card, its missing corner matching fragments discovered inside Vale's coat pocket earlier tonight. Behind him, the manor doors slammed shut, and every candle extinguished simultaneously, leaving one whispered accusation hanging in darkness alone. “You should not have returned,” murmured a voice from the corridor, using the exact phrase found beneath the victim's fingernails. Vale turned, but the corridor stood empty, except for a fresh red handprint pressed against the wallpaper directly behind him. On its palm, someone had drawn a tiny black star, the private symbol of the person who murdered Vale's brother.
created_at
"2026-07-09T18:15:42.253Z"
7/9/2026, 6:15:42 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2291
moderation_latency
(null)
generation_time
11604
tokens_prompt
46
tokens_completion
672
native_tokens_prompt
41
native_tokens_completion
1236
native_tokens_completion_images
0
native_tokens_reasoning
1034
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
0.007457
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0fcebd3e35cccb46016a4fe54e603c8197a5705d9029ea17a7"
is_byok
false
latency
294
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-1783620942-XuccTOwvVTy7nyZfzLno"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620942-vhl0xnHMKJFZbdwPHaj7"
upstream_id
"resp_0fcebd3e35cccb46016a4fe54e603c8197a5705d9029ea17a7"
total_cost
0.007457
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