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Run: 2026-09-23-01M36R9VBD7KNF02F855G3JG23
Run Details
Model:
GPT-6 Luna (Reasoning, High)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
18.4s
Cost:
$0.000975
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 lighthouse bell rang once, though its keeper had been dead for three days and buried far inland. Mara Vale heard it from the manor library, where rain tapped the windows like impatient fingers seeking entry after midnight. She looked up from the unsigned will and found the grandfather clock stopped at precisely eleven seventeen that wet evening. Across the room, Inspector Shaw stood beside a corpse none remembered inviting, with white gloves folded neatly across its chest. The dead man wore Mara's father's signet ring, missing since the night her mother vanished without explanation from the house. Shaw noticed her staring, then asked whether she recognized the victim, while thunder swallowed the answer she nearly gave aloud. Before Mara could speak, someone upstairs began playing the dead keeper's hymn on a piano, though every room stood empty. Inspector Shaw reached for his notebook, but Mara recognized the melody and whispered, “That song was played at Father's funeral.”
created_at
"2026-09-23T09:07:15.965Z"
9/23/2026, 9:07:15 AM
model
"openai/gpt-6-luna-20260922"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
17715
moderation_latency
(null)
generation_time
18218
tokens_prompt
46
tokens_completion
258
native_tokens_prompt
41
native_tokens_completion
1942
native_tokens_completion_images
0
native_tokens_reasoning
1750
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
0.0009751
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1790154436-9KBCTOP1XHHi9I5Wl1cO"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790154436-fmAYUh9IamAwGb78084A"
upstream_id
"resp_0dae932a3a2e8644016ab396c483dc87d1ba70dfb96c53bb2d"
provider_responses
0
endpoint_id
"05e94e02-b9c2-4bbb-ba55-4082ee9ad687"
id
"resp_0dae932a3a2e8644016ab396c483dc87d1ba70dfb96c53bb2d"
is_byok
false
latency
1341
model_permaslug
"openai/gpt-6-luna-20260922"
provider_name
"OpenAI"
status
200
total_cost
0.0009751
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