NC Bench
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Run: 2026-02-16-01KHKA76T1PKRDV7SSGZVJ5VJW
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
17.8s
Cost:
$0.015094
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
Fog pressed against Briarwood Manor as Detective Lena Hart arrived, summoned by a midnight call from the caretaker outside town. Inside, chandeliers flickered above silent portraits, and the guests whispered like conspirators while rain stitched the windows shut all night. A violin case lay open on the marble, yet the instrument was missing, leaving only rosined dust near fresh footprints. Lena followed the butler downstairs, where a locked study door stood ajar, breathing tobacco and bitter ink into cold hallway. On the carpet, Lord Ashcroft sprawled beside his desk, throat pierced neatly, his watch stopped at twelve thirteen exactly sharp. No window was broken, no safe was opened, but a single playing card rested between his pale fingers facedown smirking. Upstairs, each guest insisted innocence, yet their stories overlapped oddly, and someone smelled of lavender and gunpowder after the storm. Lena pocketed the card, listening to the manor's ticking pipes, and wondered who feared tomorrow's inheritance most among them all.
created_at
"2026-02-16T13:29:02.378526+00:00"
2/16/2026, 1:29:02 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
16013
moderation_latency
(null)
generation_time
17634
tokens_prompt
46
tokens_completion
269
native_tokens_prompt
41
native_tokens_completion
1073
native_tokens_completion_images
0
native_tokens_reasoning
853
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
0.01509375
router
(null)
provider_responses
0
id
"resp_01cc0bac7b2c24830169931b8c2cd88194add720aaf4fb17b5"
status
200
is_byok
false
latency
158
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771248524-k9xlbC8Gy5UQs28Npywu"
upstream_id
"resp_01cc0bac7b2c24830169931b8c2cd88194add720aaf4fb17b5"
total_cost
0.01509375
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20