NC Bench
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Run: 2026-02-16-01KHKA9YDFJBVZXFZ7686MJHXV
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
17.1s
Cost:
$0.015164
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 drifted over Blackwater Manor as the last guests departed, leaving lanterns guttering in the courtyard stones at midnight silently. Inside, Clara Finch found the library door ajar and heard a soft thud behind the velvet curtains just then again. She pushed through, smelling cigar smoke and rain, and saw Colonel Wren sprawled beside the fireplace, unmoving in ashen silence. A silver letter opener protruded from his chest, and the clock above him ticked with nervous precision for all watching. Clara's scream summoned the household, but Detective Hale arrived first, coat dripping, eyes sharp as cut glass in that moment. He knelt, touched the opener, and noted no blood on its handle, only a faint scent of almonds nearby books. The guests returned to the hall, whispering alibis, while Hale studied muddy footprints leading toward the conservatory door outside alone. On the mantel, a torn invitation lay beneath a chess king, and Hale smiled at the missing queen tonight too.
created_at
"2026-02-16T13:30:31.411827+00:00"
2/16/2026, 1:30:31 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5209
moderation_latency
(null)
generation_time
16887
tokens_prompt
46
tokens_completion
635
native_tokens_prompt
41
native_tokens_completion
1078
native_tokens_completion_images
0
native_tokens_reasoning
862
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
0.01516375
router
(null)
provider_responses
0
id
"resp_05a8327daa2bde5e0169931be5e82c8197a707e3dc2de37867"
status
200
is_byok
false
latency
182
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771248613-Ue2rRTKBYK0VNl0WJmHW"
upstream_id
"resp_05a8327daa2bde5e0169931be5e82c8197a707e3dc2de37867"
total_cost
0.01516375
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