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Run: 2026-09-23-01M36NTD83CEN6DSBWZ2A3BSNJ
Run Details
Model:
GPT-6 Luna (Reasoning, Medium)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
13.8s
Cost:
$0.000608
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 clock above Bellweather Station stopped, though every passenger swore they had heard it strike thirteen again tonight. Detective Mara Venn arrived carrying a wet umbrella, a sealed warrant, and the certainty someone had summoned her too late. Inside the room, twelve strangers stood around a man whose throat was untouched, yet whose shadow lay facedown beneath him. His ticket named no destination, his pockets held seawater, and the stationmaster insisted the dead man had boarded without witnesses. Mara crouched beside the corpse and noticed one fresh footprint in dust, pointing away from every door in the room. Then the clock began ticking backward, and all twelve strangers turned toward Mara as though expecting her to explain why. She recognized the footprint’s narrow heel immediately; it matched the impression she had left beside her own bed that morning.
created_at
"2026-09-23T08:23:52.841Z"
9/23/2026, 8:23:52 AM
model
"openai/gpt-6-luna-20260922"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
12708
moderation_latency
(null)
generation_time
13797
tokens_prompt
46
tokens_completion
227
native_tokens_prompt
41
native_tokens_completion
1208
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
0.0006081
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer
(null)
request_id
"req-1790151832-0VeXxUa5p1ONFfr0Eq6k"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790151832-D6308Jp0vcvH5E3TL7rI"
upstream_id
"resp_035227a0be7facaa016ab38c98f2b887d19eaf14e01b2aad60"
provider_responses
0
endpoint_id
"05e94e02-b9c2-4bbb-ba55-4082ee9ad687"
id
"resp_035227a0be7facaa016ab38c98f2b887d19eaf14e01b2aad60"
is_byok
false
latency
1262
model_permaslug
"openai/gpt-6-luna-20260922"
provider_name
"OpenAI"
status
200
total_cost
0.0006081
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20