NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-16-01KHKAAAEDBFWN1QCVVHHBP6GV
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
15.5s
Cost:
$0.012322
Provider:
OpenAI
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 stitched silver lines across Hawthorne Manor as Detective Mara Quinn climbed the porch steps, summoned at midnight without warning. Inside, candlelight trembled on wallpaper roses, and the butler held out a note signed with unfamiliar initials only to her. The guests waited in the music room, whispering behind gloves, while a phonograph clicked softly between songs for the moment. Upstairs, Lord Ashbury lay facedown near the library door, his pocket watch stopped at one thirteen exactly, and blood cooled. Mara noticed muddy prints leading toward the conservatory, yet every boot in the hall appeared freshly polished under harsh lamps. A gardener swore he heard laughter outside, but the storm swallowed details, leaving only shattered glass nearby in wet gravel. When Mara opened the note, a single sentence warned her that the killer would greet her first before dawn arrived.
created_at
"2026-02-16T13:30:42.21525+00:00"
2/16/2026, 1:30:42 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4759
moderation_latency
(null)
generation_time
15255
tokens_prompt
46
tokens_completion
667
native_tokens_prompt
41
native_tokens_completion
875
native_tokens_completion_images
0
native_tokens_reasoning
692
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.01232175
router
(null)
provider_responses
0
id
"resp_02739515e75541d20169931bf23498819382fd9dcf47a5b699"
status
200
is_byok
false
latency
159
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771248626-R4KzVniQbQXcFHyx34uL"
upstream_id
"resp_02739515e75541d20169931bf23498819382fd9dcf47a5b699"
total_cost
0.01232175
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Matches word count
n/a
neededClean
false
sentences
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20