NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-07-09-01KX41HZD8N52H5FAQEAV6M4X9
Run Details
Model:
GPT-5.6 Luna (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
7.6s
Cost:
$0.009089
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, Detective Mara Vale found the mayor's body beneath the conservatory's shattered glass, surrounded by unnaturally blooming crimson roses. Her lantern revealed a silver cufflink clenched inside his fist, bearing the initials of someone officially declared dead last winter. Beyond the locked doors, rain hammered the windows while an unseen violin played the mayor's favorite waltz downstairs without pause. Mara noticed muddy footprints crossing the marble floor, yet every print pointed toward the body instead of away from it. The housekeeper arrived breathless, claiming she had heard three gunshots, though the revolver beside him contained only two bullets remaining. Then the grandfather clock struck thirteen, and every candle in the conservatory extinguished simultaneously, leaving Mara alone with impossible evidence. From the darkness, someone whispered her childhood nickname, a name known only to Mara and the murdered mayor until tonight. She raised her pistol, but the voice laughed softly, promising that this first death had merely opened something far worse.
created_at
"2026-07-09T18:17:05.201Z"
7/9/2026, 6:17:05 PM
model
"openai/gpt-5.6-luna-20260709"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2201
moderation_latency
(null)
generation_time
7034
tokens_prompt
46
tokens_completion
565
native_tokens_prompt
41
native_tokens_completion
1508
native_tokens_completion_images
0
native_tokens_reasoning
1304
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
0.009089
router
(null)
provider_responses
0
endpoint_id
"eebea444-34a5-4642-a766-cb319471d33a"
id
"resp_0a669d90e9f0b182016a4fe5a149bc8197be0c6a8128e5c2e2"
is_byok
false
latency
208
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-1783621025-R8GrKcFPoOZWf0JNnyVV"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1783621025-WRBAmgzWHJTzNtN9zHnE"
upstream_id
"resp_0a669d90e9f0b182016a4fe5a149bc8197be0c6a8128e5c2e2"
total_cost
0.009089
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