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Run: 2026-02-25-01KJ95180QW7BXB3DGWN92QXFT
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
5.2s
Cost:
$0.002519
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
77.74%
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
The old house loomed, a dark monolith, under a bruised sky. Rain lashed against the grimy windowpanes, a furious, incessant torrent. Inside, Detective Miller shivered, despite the roaring fireplace's heat. He knew tonight would be long, certainly unforgettable, filled with dread. A sudden shrill scream pierced the storm, chilling all occupants. Footsteps thudded heavily above him, a frantic, desperate, hurried sound. Miller raced up the grand, curving staircase, heart pounding wildly. The master bedroom door stood ajar, revealing disturbing shadows within. A maid knelt there, sobbing uncontrollably beside a crumpled form. Her wide eyes stared at Miller, filled with unspeakable horror. On the plush carpet lay Reginald Blackwood, perfectly still, clearly dead. A sterling silver letter opener protruded from his neatly pressed shirt. Blood bloomed dark crimson, staining expensive fabric in the dim light. The maid pointed a trembling finger, whispering one name to him. "He always hated her," she choked, utterly heartbroken, completely undone. Miller took a deep breath, surveying the grisly scene of crime. This closed circle now held a killer. Nobody could leave.
created_at
"2026-02-25T01:01:23.358Z"
2/25/2026, 1:01:23 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1860
moderation_latency
(null)
generation_time
5191
tokens_prompt
46
tokens_completion
692
native_tokens_prompt
38
native_tokens_completion
1003
native_tokens_completion_images
0
native_tokens_reasoning
768
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
0.0025189
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1680
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981283-2Sb6QRJEGfXM1c1DgHb7"
upstream_id
(null)
total_cost
0.0025189
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
77.74%
Matches word count
n/a
neededClean
false
sentences
18
wordCounts
0
11
1
10
2
9
3
11
4
10
5
10
6
10
7
10
8
10
9
10
10
11
11
11
12
11
13
11
14
10
15
11
16
7
17
3