NC Bench
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Run: 2026-02-19-01KHVP8P8RP42YCT4DJ4YRQWSV
Run Details
Model:
Gemini 3.1 Pro (Preview)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
55.8s
Cost:
$0.059404
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 battered the large glass windows of the isolated mansion when Detective Blackwood stepped into the dark silent study. Lord Harrington lay completely motionless on the expensive red Persian rug with a sharp silver dagger piercing his upper back. A single lamp flickered weakly on the mahogany desk, casting long shadows across the walls of the terrifying crime scene. Beside the cold body rested a shattered crystal glass that still smelled strongly of aged whiskey and bitter almond poison. The heavy oak door remained securely locked from the inside so the cruel killer had seemingly vanished without any trace. Blackwood knelt carefully beside the wealthy victim and pulled a small leather notebook from his own damp brown trench coat. Everyone in this deceitful house possessed a terrible secret, but only one suspect possessed the absolute courage to commit murder.
created_at
"2026-02-19T19:33:10.904Z"
2/19/2026, 7:33:10 PM
model
"google/gemini-3.1-pro-preview-20260219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3291
moderation_latency
(null)
generation_time
55661
tokens_prompt
46
tokens_completion
1237
native_tokens_prompt
38
native_tokens_completion
4944
native_tokens_completion_images
0
native_tokens_reasoning
4791
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
0.059404
router
(null)
provider_responses
0
endpoint_id
"2abf5677-0826-45d9-8470-3d62c31d54a1"
is_byok
false
latency
3291
model_permaslug
"google/gemini-3.1-pro-preview-20260219"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771529590-8vnFCN80PUgftEfYj9GS"
upstream_id
(null)
total_cost
0.059404
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20