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Run: 2026-02-25-01KJ94JF07E5JPEE8A7DH9CGXB
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.3s
Cost:
$0.003069
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
10.35%
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 the attic window, masking the city's usual midnight symphony with its relentless, unforgiving rhythm. Detective Miles Corbin pushed open the creaking gate, his trench coat already soaked through to the bone tonight, shivering. A faint light glowed from the mansion's topmost floor, casting long, eerie shadows across the overgrown lawn now. He found the side door ajar, an invitation to a horror he certainly wished he had never received. Damp silence swallowed him whole as he stepped inside, the chill instantly biting at his exposed neck. She lay sprawled on the Persian rug, a silent, macabre tableau beneath the fractured chandelier above. Her wide eyes stared sightlessly at the ornate ceiling, reflecting only the dust motes slowly dancing. A single, emerald brooch glittered darkly beside her hand, a final, chilling message left here. Corbin felt a cold dread settle deep into his gut, a familiar companion on these dark nights. Another victim, another twisted game; the killer had undoubtedly just begun playing their deadly game.
created_at
"2026-02-25T00:53:18.987Z"
2/25/2026, 12:53:18 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1378
moderation_latency
(null)
generation_time
6323
tokens_prompt
46
tokens_completion
797
native_tokens_prompt
38
native_tokens_completion
1223
native_tokens_completion_images
0
native_tokens_reasoning
1018
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
0.0030689
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1378
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771980798-NEfzu4l0sEqfxKUImnXw"
upstream_id
(null)
total_cost
0.0030689
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
10.35%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
18
1
19
2
18
3
18
4
17
5
16
6
16
7
15
8
17
9
15