NC Bench
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Run: 2026-02-16-01KHKB1WNGCGD1024GQD3D9SYP
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
19.0s
Cost:
$0.012056
Provider:
OpenAI
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 stitched the cobblestones as midnight swallowed Harrowgate's narrow lanes. Detective Mara Vale arrived, coat dripping, eyes sharp, silent tonight. A lantern swung outside Bellamy Manor, casting nervous shadows inward. The butler waited at the door, hands trembling slightly still. Inside, guests whispered around champagne, avoiding the upstairs corridor entirely. Somewhere above, a music box played, then abruptly stopped dead. Mara climbed slowly, counting steps, listening for breath or lies. At the landing, crimson seeped beneath the study's locked door. She knelt, smelled iron, and heard someone weeping behind curtains. When the key turned, Lord Bellamy lay smiling, throat opened. On his desk, a note read: 'Trust no one here'. Mara pocketed it, knowing the killer watched from darkness nearby.
created_at
"2026-02-16T13:43:38.13057+00:00"
2/16/2026, 1:43:38 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
6000
moderation_latency
(null)
generation_time
17678
tokens_prompt
46
tokens_completion
595
native_tokens_prompt
41
native_tokens_completion
856
native_tokens_completion_images
0
native_tokens_reasoning
670
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
0.01205575
router
(null)
provider_responses
0
id
"resp_07286178f1a358950169931ef7a6c88196a91ae0dee89806b6"
status
200
is_byok
false
latency
209
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771249399-JBWlvQNi1hsaxTpvOaSC"
upstream_id
"resp_07286178f1a358950169931ef7a6c88196a91ae0dee89806b6"
total_cost
0.01205575
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
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