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Run: 2026-02-25-01KJ95RWPV5466W5PEKW5TDB82
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
7.8s
Cost:
$0.004184
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
2.91%
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
The grand old manor house stood dark and still, cloaked in an unsettling silence that felt profoundly wrong. Detective Miles Corbin stepped from his idling vehicle, adjusting his trench coat against the unwelcome, bone-chilling night. A uniformed officer met him quickly, nodding gravely before leading the way inside, his face gravely pale tonight. The air within the foyer hung heavy with the distinct coppery scent of fresh spilled blood here. Broken crystal shimmered under harsh lights, scattering sharp fragments across the polished marble floor nearby. "The body is upstairs, sir," the young officer murmured quietly, his voice barely a hushed whisper then. Miles ascended the wide winding staircase, his heavy boots echoing loudly in the vast, disturbing emptiness. The master bedroom door stood ajar, revealing a tableau of chaos frozen forever in the terrible room. A woman lay crumpled beside an antique writing desk, her expensive silk gown now deeply stained crimson. Her wide, vacant eyes stared sightlessly at the ornate ceiling, reflecting no light, no future, no hope. A single, intricate silver letter opener protruded viciously from her delicate, still and silent chest. Miles felt the familiar cold dread settle deep within his gut, another life brutally ended too soon.
created_at
"2026-02-25T01:14:18.209Z"
2/25/2026, 1:14:18 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1249
moderation_latency
(null)
generation_time
7740
tokens_prompt
46
tokens_completion
1046
native_tokens_prompt
38
native_tokens_completion
1669
native_tokens_completion_images
0
native_tokens_reasoning
1431
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
0.0041839
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1249
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771982058-YvyYMZBe9UZkdiMCsV6w"
upstream_id
(null)
total_cost
0.0041839
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
2.91%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
18
1
17
2
18
3
17
4
15
5
17
6
16
7
17
8
17
9
17
10
15
11
17