NC Bench
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Run: 2026-02-25-01KJ95NP7H907AQ02R9D3TTH43
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
12.6s
Cost:
$0.006191
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
97.41%
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 grand old manor stood silent, completely still, cloaked now. Rain lashed the windows, a relentless rhythm against the glass. Inside, the air hung heavy with a strange, metallic scent. Detective Miles Thorne pushed open the ornate, heavy oak door. His breath ghosted white in the unheated, frigid, expansive hall. A uniformed officer met him, face grim, barely speaking words. "Master bedroom, upstairs, sir. A terrible sight awaits you." A silent nod confirmed the worst of Miles's grave expectations. He ascended the grand staircase, each creak echoing loudly now. The oppressive silence spoke volumes, chilling him to the bone. He found her sprawled across a luxurious, crimson Persian rug. Lady Eleanor Blackwood lay lifeless, eyes staring at the ceiling. A single, ornate letter opener pierced her silk evening gown. Crimson bloomed shockingly bright against the pale fabric, clear stain. No signs of forced entry, no struggle, just chilling stillness. The expensive room held secrets, whispering tales of sharp betrayal. Miles knelt, searching her face for any final, silent message. Her expression remained fixed, a mask of serene, cold surprise. This was not a robbery; this felt deeply, personally planned. The killer left no obvious trace, only a lingering, cold dread.
created_at
"2026-02-25T01:12:33.275Z"
2/25/2026, 1:12:33 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1264
moderation_latency
(null)
generation_time
12543
tokens_prompt
46
tokens_completion
2584
native_tokens_prompt
38
native_tokens_completion
2472
native_tokens_completion_images
0
native_tokens_reasoning
2200
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
0.0061914
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1264
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981953-FMADbfrQNJLIoKK0l7fG"
upstream_id
(null)
total_cost
0.0061914
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
97.41%
Matches word count
n/a
neededClean
false
sentences
20
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
9
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10
15
10
16
10
17
10
18
10
19
11