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Run: 2026-09-23-01M36RFJ2G0GVGAVM8A0QE0MKQ
Run Details
Model:
GPT-6 Luna (Reasoning, High)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.6s
Cost:
$0.000694
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 doors stood ajar, spilling lamplight across the snow and illuminating a single crimson footprint. Detective Mara Venn arrived alone, her coat unbuttoned, while the entrance clock struck thirteen with a shudder, then stopped dead. Inside, Professor Hale lay faceup beneath the star chart, his silver spectacles folded neatly beside an untouched cup of tea. Nothing appeared disturbed except the window latch, gleaming wetly against the room’s bitter, perfectly dry air, and the overturned chair. Venn knelt beside him, noticing a tiny paper boat tucked beneath Hale’s palm, its folded sail marked with fresh blood. Then the dead professor’s watch chimed once, though its hands had been removed, and someone whispered her name from upstairs.
created_at
"2026-09-23T09:10:23.071Z"
9/23/2026, 9:10:23 AM
model
"openai/gpt-6-luna-20260922"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3974
moderation_latency
(null)
generation_time
14549
tokens_prompt
46
tokens_completion
475
native_tokens_prompt
41
native_tokens_completion
1380
native_tokens_completion_images
0
native_tokens_reasoning
1215
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
0.0006941
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1790154623-32F1LIAmBXP2GFBD6wfN"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790154623-l2Mos7fI7yyEo3xYjxuF"
upstream_id
"resp_0c9a5ee813b20fcd016ab3977f37e887d18c444d320cb8aeea"
provider_responses
0
endpoint_id
"05e94e02-b9c2-4bbb-ba55-4082ee9ad687"
id
"resp_0c9a5ee813b20fcd016ab3977f37e887d18c444d320cb8aeea"
is_byok
false
latency
575
model_permaslug
"openai/gpt-6-luna-20260922"
provider_name
"OpenAI"
status
200
total_cost
0.0006941
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
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20