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Run: 2026-07-09-01KX407XB36362JX6909AETNAJ
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
10.4s
Cost:
$0.006467
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
Rain needled the courthouse windows while Inspector Vale discovered a dead judge beneath the abandoned witness stand before dawn, alone. A silver key rested between the judge’s fingers, polished clean except for one crimson thread caught beneath its jagged teeth. Vale heard footsteps above him, though the courthouse had stood empty since midnight, locked from every entrance without exception tonight. On the judge’s desk, an unsigned verdict waited beside two teacups, one warm, one dusted with ash, and fresh blood. The clock behind the bench chimed thirteen times, then stopped, leaving Vale alone with the impossible arithmetic of that hour. When Vale turned the key over, a tiny inscription gleamed: “RETURN WHAT YOU STOLE, OR BURY ANOTHER, BEFORE DAYBREAK, INSPECTOR.” From the gallery, someone applauded softly, and every courtroom door swung open at precisely the same moment without any warning.
created_at
"2026-07-09T17:54:06.827Z"
7/9/2026, 5:54:06 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2277
moderation_latency
(null)
generation_time
10118
tokens_prompt
46
tokens_completion
814
native_tokens_prompt
41
native_tokens_completion
1071
native_tokens_completion_images
0
native_tokens_reasoning
884
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
0.006467
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_07a8974ada4d4c74016a4fe03ee2ec81969d3f20b72c6f4f2c"
is_byok
false
latency
233
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-1783619646-MgCh4Pm47VgxJi6M3O5J"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783619646-QGBcVGVndBMLRqB45AgF"
upstream_id
"resp_07a8974ada4d4c74016a4fe03ee2ec81969d3f20b72c6f4f2c"
total_cost
0.006467
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20