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Run: 2026-07-09-01KX416G9A225VPSQHFQ7HYCRW
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
10.2s
Cost:
$0.010715
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, Inspector Vale found the mayor's body beneath the ballroom chandelier, surrounded by roses and an unnaturally deep silence. Rain clawed the windows while twelve guests watched Vale kneel, each wearing an expression carefully practiced for innocence and fear. The victim's silver watch had stopped at eleven seventeen, precisely when the orchestra abruptly lost its final, discordant note forever. Vale noticed mud beneath the rug, though every guest insisted nobody had entered through the garden after sunset that evening. Then the lights flickered, revealing a lipstick mark on the dead man's collar, bright as a warning against white linen. A violin string snapped upstairs, and every face turned toward the locked gallery door except one, which remained perfectly still. Vale studied the silent guest, a woman whose gloved hands concealed something small, sharp, and unmistakably wet beneath her sleeve. Before he could speak, she smiled and whispered, “Ask who invited the storm, Inspector, and why it answered so loudly.” Outside, thunder rolled across the rooftops, and somewhere inside the mansion, a second body struck the floor with another thud.
created_at
"2026-07-09T18:10:49.266Z"
7/9/2026, 6:10:49 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2214
moderation_latency
(null)
generation_time
9934
tokens_prompt
46
tokens_completion
869
native_tokens_prompt
41
native_tokens_completion
1779
native_tokens_completion_images
0
native_tokens_reasoning
1551
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
0.010715
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0bb7a909fd939954016a4fe429551c8196b75fab2f52b879d0"
is_byok
false
latency
235
model_permaslug
"openai/gpt-5.6-luna-20260709"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1783620649-MO6dEp02NqugdSsusrri"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620649-IU1XGZ3d8mUQUQYPxfKb"
upstream_id
"resp_0bb7a909fd939954016a4fe429551c8196b75fab2f52b879d0"
total_cost
0.010715
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
response_cache_source_id
(null)
data_region
"global"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20