NC Bench
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Run: 2026-02-25-01KJ950GQGBFD9NT8KQJ1SE4DJ
Run Details
Model:
Gemini 2.5 Flash Lite (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.8s
Cost:
$0.000455
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
67.21%
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 ancient grandfather clock in the deserted hall had stopped precisely at midnight, marking an ominous end to the stormy evening. Detective Miles Corbin, his trench coat damp from the persistent rain, cautiously pushed open the grand oak door to the library. A single, ornate candelabra lay shattered near the victim, its wax pooling like tears on the expensive, blood-stained velvet carpet. Lord Harrington, patriarch of the infamous family fortune, slumped grotesquely in his favourite armchair, his life cruelly extinguished without a sound. His usually impeccable silver hair was matted and dark, hinting at a violent struggle that had clearly preceded his untimely demise. A peculiar, single red rose rested upon his chest, its thorns unusually sharp, perhaps meant as a final, defiant, chilling message.
created_at
"2026-02-25T01:00:59.509Z"
2/25/2026, 1:00:59 AM
model
"google/gemini-2.5-flash-lite"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1023
moderation_latency
(null)
generation_time
4736
tokens_prompt
46
tokens_completion
641
native_tokens_prompt
38
native_tokens_completion
1128
native_tokens_completion_images
0
native_tokens_reasoning
974
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
0.000455
router
(null)
provider_responses
0
endpoint_id
"ce839073-aa24-4f29-8358-15b319bd05ec"
is_byok
false
latency
1023
model_permaslug
"google/gemini-2.5-flash-lite"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981259-BRgjE4XtTJAeaUnR6K3c"
upstream_id
(null)
total_cost
0.000455
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
67.21%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
21
1
21
2
20
3
21
4
21
5
21