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Run: 2026-02-25-01KJ95B80F9C1R4WJVNETMBXFP
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
5.7s
Cost:
$0.003096
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
1.41%
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 manor house stood dark and silent on the isolated, wind-swept moor, quite deserted. Inside, the vast ballroom lay hushed, save for the quiet murmur of disturbed air currents softly. Detective Inspector Thorne pushed open the heavy oak doors, his breath clouding visibly in the chill air. A uniformed constable, pale and shaken, stood rigidly near the ornate fireplace, pointing a grim finger forward. On the crimson Persian rug, a man lay sprawled, his vacant eyes staring up at the shadowed chandelier. Blood blossomed darkly on his pristine white tuxedo shirt, chilling the very atmosphere significantly. A delicately painted porcelain teacup lay shattered beside him, its pieces reflecting the dim emergency lighting. Thorne knelt carefully, observing the scene with practiced, unblinking eyes, noting all the surrounding details. No obvious murder weapon presented itself anywhere nearby, deepening the immediate puzzling circumstances profoundly. "Cause of death is blunt force trauma, Inspector," the constable whispered, his voice barely audible and trembling. Thorne reached for his small notebook, a cold determination settling firmly within his professional heart. This grand, silent house held a terrible secret, and he would painstakingly uncover it quite soon.
created_at
"2026-02-25T01:06:51.029Z"
2/25/2026, 1:06:51 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1328
moderation_latency
(null)
generation_time
5701
tokens_prompt
46
tokens_completion
1064
native_tokens_prompt
38
native_tokens_completion
1234
native_tokens_completion_images
0
native_tokens_reasoning
1004
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
0.0030964
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1328
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771981611-s7fRSm45YSAQyi5MmCaW"
upstream_id
(null)
total_cost
0.0030964
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
1.41%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
15
1
16
2
17
3
17
4
18
5
14
6
16
7
15
8
14
9
17
10
15
11
16