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Run: 2026-07-09-01KX40D4H4MRERWR76PB2A1M1Y
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
5.5s
Cost:
$0.005423
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 discovered the mayor's body beneath the conservatory stairs, surrounded by roses that smelled faintly of almonds. Rain tapped the stained glass while seven guests gathered upstairs, each claiming innocence, each hiding something sharper than grief itself. Vale noticed one muddy footprint pointing inward, though every door remained locked and the windows overlooked a sheer cliff below. The victim's pocket watch had stopped at eleven seventeen, precisely when the orchestra downstairs began playing without its conductor present. A crimson thread clung to the mayor's cuff, matching no garment worn by anyone assembled in the candlelit hall nearby. Then the lights failed, and someone whispered Vale's name from inside the locked conservatory, where the dead man waited alone. When illumination returned, the roses had vanished, leaving only damp soil and a silver button beneath the corpse's hand clenched. Vale closed the doors, studied seven frightened faces, and announced that the murderer had remained among them all evening long.
created_at
"2026-07-09T17:56:58.029Z"
7/9/2026, 5:56:58 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4538
moderation_latency
(null)
generation_time
5291
tokens_prompt
46
tokens_completion
279
native_tokens_prompt
41
native_tokens_completion
897
native_tokens_completion_images
0
native_tokens_reasoning
699
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
0.005423
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0a2ff9966edf0052016a4fe0ea1d588196aa1455c053318d02"
is_byok
false
latency
278
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-1783619818-mfQbyKp50UuhAafNvzxN"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783619818-7ueBIDkIfVRXwGIYmwg3"
upstream_id
"resp_0a2ff9966edf0052016a4fe0ea1d588196aa1455c053318d02"
total_cost
0.005423
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20