NC Bench
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Run: 2026-02-19-01KHVP60DDKPJ9XMP3GQPC7K8T
Run Details
Model:
Gemini 3.1 Pro (Preview)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 7s
Cost:
$0.064888
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
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 pounded against the window of the mansion as Detective Vance stared at the lifeless body on the expensive rug. Blood stained the pristine white fabric of his silk shirt beneath the warm glow of a massive crystal chandelier above. A tall grandfather clock ticked softly in the silent room while three nervous suspects waited near the closed wooden doors. Lord Blackwood had been a cruel man during his long life, but nobody expected him to die like this tonight. The murder weapon was clearly missing from the crime scene, leaving the seasoned detective searching for a hidden secondary clue. Lightning flashed across the stormy sky outside, briefly illuminating the pale face of the beautiful widow standing by the fireplace. She held a delicate glass of red wine in her right hand with perfect grace despite the terribly chaotic situation. Vance observed her carefully before turning his sharp attention toward the locked door at the far end of the hallway. Someone locked that solid oak door from the inside before brutally stabbing the wealthy aristocrat right through his cold heart. Only three people possessed the missing brass key required to gain access into this strictly forbidden study during the storm.
created_at
"2026-02-19T19:31:42.995Z"
2/19/2026, 7:31:42 PM
model
"google/gemini-3.1-pro-preview-20260219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3623
moderation_latency
(null)
generation_time
66779
tokens_prompt
46
tokens_completion
1892
native_tokens_prompt
38
native_tokens_completion
5401
native_tokens_completion_images
0
native_tokens_reasoning
5184
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
"STOP"
usage
0.064888
router
(null)
provider_responses
0
endpoint_id
"2abf5677-0826-45d9-8470-3d62c31d54a1"
is_byok
false
latency
3623
model_permaslug
"google/gemini-3.1-pro-preview-20260219"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771529503-KJCesQHBzszjR6n33UuR"
upstream_id
(null)
total_cost
0.064888
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20