NC Bench
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Run: 2026-02-19-01KHVPCFCBGD8NMRXE33E4M9VM
Run Details
Model:
Gemini 3.1 Pro (Preview)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
53.9s
Cost:
$0.056116
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
Heavy rain relentlessly hammered against the shattered stained glass window of the remarkably opulent and dimly lit Victorian manor library. Lord Harrington lay completely motionless upon his priceless Persian rug, a crimson pool spreading slowly across the intricate woven patterns. Inspector Vance carefully stepped into the freezing room while adjusting his soaked trench coat over his broad and weary shoulders. A silver candlestick covered in fresh blood rested just a few inches away from the brutally crushed and battered skull. Lightning flashed suddenly across the dark sky, casting long and terrifying shadows over the deeply unsettling and ghastly crime scene. Someone had decisively stopped the grandfather clock at precisely midnight, leaving an eerie silence hanging heavily within the vast space. The heavy oak door squeaked open behind him as a terrified maid stood trembling violently while gripping an empty tray. Vance sighed quietly beneath his breath because he realized this particular murder would become his most difficult unsolved mystery yet. Looking closely at the cold victim, he noticed a strange green feather clutched tightly within the stiff, pale left hand. The true killer was undeniably still hiding somewhere inside this incredibly massive and entirely isolated old estate tonight, waiting patiently.
created_at
"2026-02-19T19:35:14.921Z"
2/19/2026, 7:35:14 PM
model
"google/gemini-3.1-pro-preview-20260219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3534
moderation_latency
(null)
generation_time
53771
tokens_prompt
46
tokens_completion
1510
native_tokens_prompt
38
native_tokens_completion
4670
native_tokens_completion_images
0
native_tokens_reasoning
4450
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
0.056116
router
(null)
provider_responses
0
endpoint_id
"2abf5677-0826-45d9-8470-3d62c31d54a1"
is_byok
false
latency
3534
model_permaslug
"google/gemini-3.1-pro-preview-20260219"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771529714-iJjWD3bMwzB0wQg7TMok"
upstream_id
(null)
total_cost
0.056116
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