NC Bench
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Run: 2026-02-16-01KHKB2CT22VG9A3M36RQVYDGE
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
19.6s
Cost:
$0.015220
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 the harbor streets, and Inspector Mara Venn followed a lantern glow toward the silent Seaward Hotel entrance alone. Inside, the lobby clock ticked too loudly, while guests whispered about missing silver and the locked upstairs suite tonight again. A bellhop led her past damp umbrellas to room twelve, where perfume lingered over spilled brandy on carpet nearby still. The maid stood trembling beside the door, claiming she heard a choked laugh, then nothing for minutes at first afterward. Mara unlatched the brass handle, and cold air slipped out, carrying smoke, seawater, and something metallic beneath the floorboards too. On the bed lay Lionel Crass, a banker, eyes open, throat bruised, hands folded as if praying for mercy quietly. The window was bolted, the key remained in the corridor, and fresh footprints ended at the wardrobe beside his coat. Mara noted the wardrobe mirror smeared with ash, and a torn telegram hidden under the victim's watch marked MIDNIGHT ONLY.
created_at
"2026-02-16T13:43:54.944999+00:00"
2/16/2026, 1:43:54 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5057
moderation_latency
(null)
generation_time
19227
tokens_prompt
46
tokens_completion
752
native_tokens_prompt
41
native_tokens_completion
1082
native_tokens_completion_images
0
native_tokens_reasoning
864
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
0.01521975
router
(null)
provider_responses
0
id
"resp_0affea969aeb3e7d0169931f0722148190af5bad1e9ddacb78"
status
200
is_byok
false
latency
195
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771249415-6mPBpx2IWR6aF7k4NUxi"
upstream_id
"resp_0affea969aeb3e7d0169931f0722148190af5bad1e9ddacb78"
total_cost
0.01521975
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