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Run: 2026-07-09-01KX414HBZRT84396NBC6Y9YBV
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
11.1s
Cost:
$0.005861
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain veiled Blackthorn Manor when Inspector Vale arrived before dawn. Inside, the library door stood open, though nobody claimed entering. Lord Ashcombe lay beside the fireplace, one hand clenched tightly. Beside him, a silver music box played one unfinished melody. Vale noticed muddy footprints ending beneath the victim's writing desk. Every window was locked, and frost sealed each outer latch. His daughter arrived breathless, insisting she discovered nothing unusual inside. Then the clock struck thirteen, silencing everyone in the hallway. Vale looked toward the portrait, whose eyes seemed freshly wet. Behind its frame, someone had hidden a bloodstained glove overnight. The glove bore Ashcombe's initials, but the blood belonged elsewhere. Vale smiled quietly, realizing the murderer remained inside the manor.
created_at
"2026-07-09T18:09:44.839Z"
7/9/2026, 6:09:44 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2240
moderation_latency
(null)
generation_time
10860
tokens_prompt
46
tokens_completion
781
native_tokens_prompt
41
native_tokens_completion
970
native_tokens_completion_images
0
native_tokens_reasoning
798
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
0.005861
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0128f4a141196711016a4fe3e8e9348196864a24471c73e0fe"
is_byok
false
latency
272
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-1783620584-HJWbkJw6rq87qasUlo9J"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783620584-8F8UZi5iZuzR0MtnYBnc"
upstream_id
"resp_0128f4a141196711016a4fe3e8e9348196864a24471c73e0fe"
total_cost
0.005861
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
12
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10