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Run: 2026-09-23-01M36P1HFES7WXDBBDCQZ3VZ4H
Run Details
Model:
GPT-6 Luna (Reasoning, Medium)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
15.7s
Cost:
$0.000938
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 bells of Blackthorn Hall rang thirteen times, though everyone inside swore the clock had stopped years ago. Mara Venn found the body beneath the grandfather clock, one gloved hand curled around a silver key bearing strange initials. She knew the dead man; everyone in the village knew Lord Vale, though each feared him for a different reason. Rain tapped against the tall windows while Mara knelt, careful not to disturb the dark pool spreading beneath his waistcoat. Behind her, the guests gathered in the doorway, whispering accusations before anyone thought to summon the nearest available police officers. Mara lifted the key, and Lord Vale’s blood gleamed on its teeth like fresh paint beneath the chandelier, unnaturally bright. Then the clock began ticking again, and every guest turned toward the locked study at the end of the hall. Mara noticed the key in her palm had vanished, leaving a tiny crown-shaped red mark burning against her skin still.
created_at
"2026-09-23T08:27:46.551Z"
9/23/2026, 8:27:46 AM
model
"openai/gpt-6-luna-20260922"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4123
moderation_latency
(null)
generation_time
15557
tokens_prompt
46
tokens_completion
531
native_tokens_prompt
41
native_tokens_completion
1868
native_tokens_completion_images
0
native_tokens_reasoning
1667
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
0.0009381
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer
(null)
request_id
"req-1790152066-EkZQECjYNppLuJQAfuQ4"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1790152066-bSc4i7XBxKrZxR2hAsI4"
upstream_id
"resp_013db1b50bfadfb2016ab38d82b5fc87d187c2b90c4096a263"
provider_responses
0
endpoint_id
"05e94e02-b9c2-4bbb-ba55-4082ee9ad687"
id
"resp_013db1b50bfadfb2016ab38d82b5fc87d187c2b90c4096a263"
is_byok
false
latency
896
model_permaslug
"openai/gpt-6-luna-20260922"
provider_name
"OpenAI"
status
200
total_cost
0.0009381
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