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Run: 2026-02-25-01KJ94XN43AJXA72Z81RSE347T
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
7.1s
Cost:
$0.004271
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
34.38%
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 steady rain slicked the cobblestone streets during the cold, early hours of a desolate Tuesday morning, utterly unwelcome. Detective Inspector Thorne adjusted his worn trench coat, pulling its damp collar tightly against his weary neck, a familiar struggle. Another late-night call had dragged him from his fitful sleep, promising another complicated, unpleasant situation, certainly unfortunate. Forensic lights cast stark, clinical shadows across the grim scene awaiting discovery behind the velvet ropes, quite revealing. A young constable shivered beside a flashing patrol car, clutching a steaming paper cup with gloved hands, looking nervous. "They found her inside the old Sinclair mansion, Inspector," the constable reported, voice trembling slightly with apprehension. Thorne nodded grimly, already anticipating the gruesome tableau lying beyond the imposing, dark wooden doors, a disturbing sight. The air inside smelled faintly of expensive perfume mixed with something metallic and terribly, irrevocably final, a morbid aroma. A woman lay sprawled upon Persian rugs, her vivid red dress a stark contrast against the dark intricate pattern. Her wide eyes stared sightlessly at the ornate ceiling, reflecting nothing but the cruel, cold stillness of death. This was not an accident; Thorne knew this terrible truth immediately, sensing a killer’s clear, deliberate message now. The quiet elegance of the room now held a profound, chilling silence, forever stained by this grotesque act.
created_at
"2026-02-25T00:59:25.705Z"
2/25/2026, 12:59:25 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1676
moderation_latency
(null)
generation_time
7032
tokens_prompt
46
tokens_completion
1092
native_tokens_prompt
38
native_tokens_completion
1704
native_tokens_completion_images
0
native_tokens_reasoning
1437
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
0.0042714
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1676
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981165-Vo1514K2w8AJ3kWkF4PE"
upstream_id
(null)
total_cost
0.0042714
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
34.38%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
19
1
20
2
17
3
18
4
19
5
17
6
18
7
19
8
19
9
18
10
18
11
18