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Run: 2026-02-25-01KJ950KK1SRRPPQAR7Y37SBNR
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.3s
Cost:
$0.004639
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
51.47%
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 rain lashed against Detective Harding's worn trench coat with relentless fury as he stepped from his car tonight. A chilling wind whipped around the desolate old manor house, making the ancient trees groan ominously above. He pulled his collar higher, his gaze scanning the overgrown path leading towards the imposing, silent structure ahead. Police sirens wailed distantly, their mournful cry adding another layer of dread to the already heavy, suffocating atmosphere. A frantic call had summoned him to this forgotten place; something deeply disturbing awaited his stern, discerning eyes. The grand front door stood slightly ajar, revealing a sliver of darkness that promised only further, undeniable despair inside. Harding pushed it open carefully, the hinges groaning loudly like a tortured soul releasing a final, agonizing breath. His flashlight cut through the gloom, illuminating dust motes dancing in the cold air, revealing the vast, silent foyer. Then he saw it, sprawled awkwardly at the foot of the sweeping staircase: a figure cloaked in vibrant crimson silk. The woman's eyes stared blankly upwards at the shadowed ceiling, reflecting unimaginable horror from her lifeless, frozen gaze. A single, dark red rose lay clutched tightly in her pale, slender fingers, hinting at a cruel, deliberate, artistic touch. The pool of blood beneath her head marred the intricate mosaic floor, stark evidence of a brutal, recent, unforgivable crime. Harding knelt slowly, his gloved hand reaching for her cold wrist, confirming the stark, undeniable tragedy instantly before him. This was no accident; someone had snuffed out this poor woman's life with malice aforethought here in this grand, decaying hall. The game had truly begun with this gruesome discovery, and Detective Harding felt a familiar thrill of impending, difficult work.
created_at
"2026-02-25T01:01:02.439Z"
2/25/2026, 1:01:02 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1170
moderation_latency
(null)
generation_time
8276
tokens_prompt
46
tokens_completion
1229
native_tokens_prompt
38
native_tokens_completion
1851
native_tokens_completion_images
0
native_tokens_reasoning
1497
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
0.0046389
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1170
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981262-qQ9efmjHqbncMAsQ4JI3"
upstream_id
(null)
total_cost
0.0046389
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
51.47%
Matches word count
n/a
neededClean
false
sentences
15
wordCounts
0
19
1
17
2
18
3
18
4
18
5
19
6
18
7
19
8
20
9
18
10
20
11
20
12
19
13
21
14
20