NC Bench
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Run: 2026-02-25-01KJ94XDD7D6HHAE4166XDPW26
Run Details
Model:
Gemini 2.5 Flash Lite (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.2s
Cost:
$0.000488
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
49.21%
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 old manor house stood silhouetted against the bruised, twilight sky, its imposing structure concealing dark secrets. Rain began to lash against the tall gothic windows, each drop a mournful whisper through the silent chambers. Inside, a solitary lamp cast long, dancing shadows across the opulent library, illuminating dust motes in the stagnant air. Lord Ashworth’s favorite armchair was overturned near the grand fireplace, its mahogany legs starkly visible against the Persian rug. A faint, metallic tang hung in the air, a sickening aroma suggesting something terrible had occurred within these walls. Detective Miles Corbin, summoned by a frantic butler, stepped cautiously through the heavy oak doors, his gaze sharp and searching. He noted the unnatural stillness pervading the room, a silence far too profound for any typical evening’s quietude. A single, expensive letter opener lay carelessly discarded beside a pool of dark, viscous liquid seeping into the wood. The faint scent of expensive brandy mingled strangely with the sharper, more unsettling odor of spilled and irreversible death. Corbin’s experienced eyes scanned the room, seeking an answer to the unspoken question hanging heavy in the oppressive atmosphere.
created_at
"2026-02-25T00:59:17.806Z"
2/25/2026, 12:59:17 AM
model
"google/gemini-2.5-flash-lite"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1289
moderation_latency
(null)
generation_time
6205
tokens_prompt
46
tokens_completion
1541
native_tokens_prompt
38
native_tokens_completion
1211
native_tokens_completion_images
0
native_tokens_reasoning
986
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
0.0004882
router
(null)
provider_responses
0
endpoint_id
"ce839073-aa24-4f29-8358-15b319bd05ec"
is_byok
false
latency
1289
model_permaslug
"google/gemini-2.5-flash-lite"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981157-EXBMb0qUlkGmg7oxLwNV"
upstream_id
(null)
total_cost
0.0004882
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
49.21%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
17
1
18
2
19
3
19
4
19
5
20
6
18
7
19
8
19
9
19