NC Bench
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Run: 2026-02-16-01KHK9JNDD8RYKVNBGZ5ZCYZ4D
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
16.7s
Cost:
$0.013764
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 the manor windows as Inspector Hale arrived, summoned by a midnight call from Lady Varrin alone tonight. In the foyer, candles guttered, and guests whispered of theft, while a gramophone played waltzes too cheerfully softly for mourning. Lady Varrin led him upstairs, past portraits watching, to the library where Sir Alistair lay facedown beside ink spilled everywhere. The window stood open, yet the latch was unbroken, and snow on the sill held no footprints at all tonight. On the desk, a sealed envelope bore Hale's name, its wax stamped with a serpent curling around roses in red. Before he touched it, the butler confessed hearing a quarrel, but claimed the voices ended suddenly upstairs near the clock. Hale studied the corpse's hand, noticing missing cufflinks, and realized everyone present wore gloves despite the fire burning bright below.
created_at
"2026-02-16T13:17:47.849703+00:00"
2/16/2026, 1:17:47 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
14484
moderation_latency
(null)
generation_time
16187
tokens_prompt
46
tokens_completion
226
native_tokens_prompt
41
native_tokens_completion
978
native_tokens_completion_images
0
native_tokens_reasoning
786
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
0.01376375
router
(null)
provider_responses
0
id
"resp_0e74821f9d1d538501699318eb024c8196aa382895019fd959"
status
200
is_byok
false
latency
23
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771247850-IFfiK2SxvlGTUaQJKKPw"
upstream_id
"resp_0e74821f9d1d538501699318eb024c8196aa382895019fd959"
total_cost
0.01376375
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