NC Bench
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Run: 2026-02-19-01KHVPKSFFPFVY7F3CR2ZD7JRC
Run Details
Model:
Gemini 3.1 Pro (Preview)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 1s
Cost:
$0.085408
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 washed over the desolate cobblestone streets while angry thunder cracked loudly against the dark, unforgiving midnight city sky. Detective Miller found the wealthy socialite lying motionless beside a discarded umbrella in the muddy alley behind the old theater. Crimson blood slowly pooled around her pale face, contrasting sharply with the white pearls wrapped tightly around her delicate throat. He crouched down carefully, ignoring the freezing water that soaked through his favorite trench coat and ruined his leather shoes. A single silver stiletto remained on her left foot, but the right shoe had mysteriously vanished into the dark shadows. Someone clearly wanted this beautiful woman dead, leaving absolutely no obvious fingerprints or useful physical evidence at the crime scene. The fatal stab wound located directly over her heart suggested an incredibly precise strike from a truly skilled professional assassin. Miller sighed heavily, realizing this brutal homicide would completely destroy both his quiet weekend and his deeply desired upcoming retirement. Suddenly, a faint metallic clinking sound echoed softly down the dark alley, immediately drawing his full and undivided professional attention. He grasped the heavy weapon tightly while walking forward to confront whoever silently watched him investigate this gruesome crime scene.
created_at
"2026-02-19T19:39:14.63Z"
2/19/2026, 7:39:14 PM
model
"google/gemini-3.1-pro-preview-20260219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2834
moderation_latency
(null)
generation_time
60677
tokens_prompt
46
tokens_completion
2262
native_tokens_prompt
38
native_tokens_completion
7111
native_tokens_completion_images
0
native_tokens_reasoning
6887
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
0.085408
router
(null)
provider_responses
0
endpoint_id
"2abf5677-0826-45d9-8470-3d62c31d54a1"
is_byok
false
latency
2834
model_permaslug
"google/gemini-3.1-pro-preview-20260219"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771529954-XcI9E9dyvFYrjbu8HvnP"
upstream_id
(null)
total_cost
0.085408
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