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Run: 2026-07-09-01KX41K4VDRWVK0DDBC56H447F
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
9.1s
Cost:
$0.009917
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 facedown beneath the conservatory clock, one hand clutching a bloodstained silver key gleaming. Rain battered the glass roof while every guest gathered outside, insisting they had heard nothing except the clock striking thirteen. Vale noticed muddy footprints leading inward, although the storm had begun after dinner and nobody admitted leaving the ballroom alone. Beside the corpse, a torn invitation displayed tonight’s date, tomorrow’s name, and an accusation of murder written in crimson ink. The message named no culprit, yet its final words made Vale glance toward the silent orchestra balcony above them all. There, a violin string trembled without music, and a single wet footprint darkened the dust beside an empty chair nearby. When the lights failed, someone whispered Vale’s name, and the locked doors opened simultaneously from somewhere inside the house again. By the time candles returned, the mayor’s body had vanished, leaving only the silver key and blood beneath the clock.
created_at
"2026-07-09T18:17:43.543Z"
7/9/2026, 6:17:43 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8337
moderation_latency
(null)
generation_time
8839
tokens_prompt
46
tokens_completion
275
native_tokens_prompt
41
native_tokens_completion
1646
native_tokens_completion_images
0
native_tokens_reasoning
1445
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
0.009917
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0a3ffab3218eb4fb016a4fe5c79ff481969f9a3f791bb14546"
is_byok
false
latency
222
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-1783621063-KSCRGng9ma4RsBHPncnA"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783621063-WGt4v79cknK4k5NQjKU2"
upstream_id
"resp_0a3ffab3218eb4fb016a4fe5c79ff481969f9a3f791bb14546"
total_cost
0.009917
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