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Run: 2026-09-23-01M36RDWSFXW7QH6R4RW8W411Y
Run Details
Model:
GPT-6 Luna (Reasoning, High)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
16.6s
Cost:
$0.000885
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, the old observatory’s brass clock stopped, though every witness swore its hands had been moving just moments earlier. Dr. Vale lay beneath the telescope, one gloved hand curled around a silver key no door in the building fit. Rain tapped the domed windows while Inspector Mara Venn studied the room’s silence and smelled fresh roses beneath the smoke. Behind her, the observatory’s seven guests stood shoulder to shoulder, each insisting they had never left the building since dinner. Mara noticed one guest’s cuffs were dry, despite the storm, and another’s shoes carried dust from the sealed east stair. The clock struck twelve, although its hands remained fixed at eleven seventeen, and every guest turned toward an unlocked door. Mara did not follow their gaze; she watched the dead man’s reflection in the telescope lens, where someone stood smiling. When she looked behind her, the doorway was empty, but wet footprints crossed the floor toward the chair behind her.
created_at
"2026-09-23T09:09:28.505Z"
9/23/2026, 9:09:28 AM
model
"openai/gpt-6-luna-20260922"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
14640
moderation_latency
(null)
generation_time
16536
tokens_prompt
46
tokens_completion
341
native_tokens_prompt
41
native_tokens_completion
1761
native_tokens_completion_images
0
native_tokens_reasoning
1552
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
0.0008846
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1790154568-qMi7wQHPXsSHZ7NZnP2W"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790154568-mOGez6bAvvkVC6luWgVY"
upstream_id
"resp_0a14987ce0ecc0ce016ab3974899ec87d199fecd01735a4bcf"
provider_responses
0
endpoint_id
"05e94e02-b9c2-4bbb-ba55-4082ee9ad687"
id
"resp_0a14987ce0ecc0ce016ab3974899ec87d199fecd01735a4bcf"
is_byok
false
latency
713
model_permaslug
"openai/gpt-6-luna-20260922"
provider_name
"OpenAI"
status
200
total_cost
0.0008846
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
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