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Run: 2026-07-09-01KX40D8CN2SER7G3V5YJN2SA2
Run Details
Model:
GPT-5.6 Luna
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.3s
Cost:
$0.000743
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
22.96%
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 discovered a bloodless corpse beneath the ballroom chandelier, clutching a single black rose tightly. Outside, rain stitched silver curtains across windows while every locked door guarded secrets no living guest dared confess aloud. The victim's pocket watch had stopped at eleven thirteen, precisely when the orchestra played its final, discordant waltz. Vale studied twelve silent faces, noticing one guest smiled nervously, while another carefully concealed mud beneath polished shoes. Then the chandelier flickered twice, and someone whispered the murderer remained inside, listening patiently among them that night.
created_at
"2026-07-09T17:57:01.983Z"
7/9/2026, 5:57:01 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
307
moderation_latency
(null)
generation_time
1148
tokens_prompt
46
tokens_completion
169
native_tokens_prompt
41
native_tokens_completion
117
native_tokens_completion_images
0
native_tokens_reasoning
0
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
0.000743
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0ca4dbda21c8c413016a4fe0ee0c188193b8098ffe83348243"
is_byok
false
latency
176
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-1783619821-DIC845LVAdrKuiXAnGI8"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783619821-XcyzZnz05o7OHEuiAPy9"
upstream_id
"resp_0ca4dbda21c8c413016a4fe0ee0c188193b8098ffe83348243"
total_cost
0.000743
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
22.96%
Matches word count
n/a
neededClean
false
sentences
5
wordCounts
0
18
1
19
2
18
3
18
4
18