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Run: 2026-02-25-01KJ95KA36PA2J49X83X20QS0K
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
7.5s
Cost:
$0.004399
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
11.87%
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 mansion cast a long, eerie shadow across the desolate, windswept, forgotten grounds as twilight approached. Detective Inspector Evelyn Reed pulled her worn trench coat tighter against the biting, unforgiving, cold evening air blowing. The flashing blue and red emergency lights pulsed rhythmically, painting the gothic architecture with a grim, sickly glow. A hushed, weighty silence hung thickly, broken only by a distant, mournful, constant police radio crackle now. Uniformed officers guarded the heavy, ornate oak door, their faces etched with serious, profound, unspoken fatigue already. Sergeant Miller met her at the threshold, his normally jovial features now a mask of grim, professional concern only. “Inside, Inspector,” he whispered, his voice low, heavy with the weight of unspeakable, discovered tragedy lying there. Evelyn stepped through the portal into a drawing-room filled with antique furniture and oppressive, stagnant air inside. A Persian rug, once vibrant, now lay stained a dark, horrifying crimson near the cold, unlit hearth.
created_at
"2026-02-25T01:11:15.308Z"
2/25/2026, 1:11:15 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1300
moderation_latency
(null)
generation_time
7488
tokens_prompt
46
tokens_completion
993
native_tokens_prompt
38
native_tokens_completion
1755
native_tokens_completion_images
0
native_tokens_reasoning
1552
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
0.0043989
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1298
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981875-dzkZoaR1cdqArgbaqpmT"
upstream_id
(null)
total_cost
0.0043989
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
11.87%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
18
1
18
2
18
3
17
4
17
5
19
6
17
7
17
8
17