NC Bench
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Run: 2026-02-16-01KHK9B4VH24EYV1MR734JFSCB
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
16.7s
Cost:
$0.014380
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 Hawthorne Manor as Inspector Lyle arrived, summoned by a frantic telegram before midnight struck again today, quietly. The iron gate groaned behind him, and the grounds smelled of wet roses and something metallic, uncomfortably close to him. Inside, candles wavered in the corridor, casting long shadows that refused to match the portraits lining walls at all tonight. A maid led him upstairs, whispering that Lord Pembroke had been found in the library, locked from within somehow dead. Lyle noted the silence, broken only by ticking clocks, while guests gathered below, rehearsing grief with practiced eyes for him. The library door stood sealed by brass bolts, yet the key lay on a tray beside untouched brandy and cigars. When the butler finally opened it, cold air spilled out, carrying perfume, ash, and the faintest seawater from somewhere nearby. On the rug, Pembroke lay facedown, a letter clutched in his hand, addressed to Inspector Lyle alone in black ink.
created_at
"2026-02-16T13:13:41.934319+00:00"
2/16/2026, 1:13:41 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5253
moderation_latency
(null)
generation_time
16399
tokens_prompt
46
tokens_completion
761
native_tokens_prompt
41
native_tokens_completion
1022
native_tokens_completion_images
0
native_tokens_reasoning
801
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
0.01437975
router
(null)
provider_responses
0
id
"resp_0012f13876ab479801699317f4add08197bde397aa2f0077ac"
status
200
is_byok
false
latency
154
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771247604-phEgPUccQ9nqYQXy28qh"
upstream_id
"resp_0012f13876ab479801699317f4add08197bde397aa2f0077ac"
total_cost
0.01437975
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