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Run: 2026-02-25-01KJ95Y6BZ9XR8FG7KTEEAA4G4
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
8.0s
Cost:
$0.004176
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
84.13%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain lashed against the grimy windowpanes of the old mansion. Wind howled, a mournful dirge through the skeletal ancient trees. Inside, the silence felt heavy, thick, profoundly unsettling now. Detective Miles Corbin pulled his trench coat tighter for warmth. His breath plumed white in the grand, drafty, cavernous hall. Sergeant Davies stood grimly near the ornate double mahogany doors. "We have a serious situation, Detective," Davies stated, voice low. Corbin nodded, his keen eyes scanning the opulent, dusty foyer. A faint, metallic scent lingered subtly in the stagnant air. He knew that smell well: the unmistakable, chilling odor of blood. Corbin moved slowly, deliberately, towards the draped entranceway ahead. The crime scene tape glowed yellow against the dim, fading light. Forensics technicians worked quietly, meticulously under the portable floodlights there. Then he saw it: a figure sprawled grotesquely upon the floor. A pool of dark crimson stained the expensive Persian rug deeply. The victim was an elderly man, clad in fine silk pajamas. His wide eyes stared blankly upward, reflecting no light, no life. "Cause of death confirmed?" Corbin asked, not breaking his gaze. Davies swallowed hard, adjusting his cap, "Blunt force trauma, sir." A heavy brass candelabra lay discarded nearby, ominously on the ground. Corbin felt the familiar cold dread settle deep within his bones. Another puzzle began, shrouded in shadow and the pouring rain.
created_at
"2026-02-25T01:17:11.94Z"
2/25/2026, 1:17:11 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1300
moderation_latency
(null)
generation_time
7993
tokens_prompt
46
tokens_completion
1061
native_tokens_prompt
38
native_tokens_completion
1666
native_tokens_completion_images
0
native_tokens_reasoning
1368
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
0.0041764
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1299
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771982231-IVe9BoJD5Uu7PfswAGEe"
upstream_id
(null)
total_cost
0.0041764
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
84.13%
Matches word count
n/a
neededClean
false
sentences
21
wordCounts
0
10
1
10
2
9
3
10
4
10
5
10
6
10
7
10
8
10
9
11
10
9
11
11
12
10
13
11
14
11
15
11
16
11
17
10
18
21
19
11
20
10