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Run: 2026-02-25-01KJ95WZZ5DGCK5RM49C2969KH
Run Details
Model:
Gemini 2.5 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.9s
Cost:
$0.003586
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
5.53%
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 wind howled its mournful song around Blackwood Manor, rattling ancient panes of cold, leaded glass. Rain lashed against the stone walls with relentless fury, mirroring the dark mood within the sprawling estate. Mrs. Albright, the long-serving housekeeper, descended the grand staircase, a flickering lantern in her trembling hand. She was checking the locks, a nightly ritual, before finally retiring to her small, quiet room. An unsettling chill, much colder than the night air, seemed to creep along the polished, wooden floorboards. A faint, coppery scent hung heavy in the musty air, striking Mrs. Albright with uncomfortable, growing dread. Her heart pounded an anxious rhythm as she moved towards the study door, slightly ajar, casting a long shadow. She pushed it open slowly, her breath catching in her throat at the terrible sight revealed inside. Sir Reginald Thorne lay slumped across his large oak desk, his usually stern eyes open wide. An ornate letter opener, now stained dark crimson, protruded starkly from his still, lifeless chest. Mrs. Albright dropped her lantern with a horrified gasp, its fragile glass shattering loudly on the floor. The shrill, piercing scream that escaped her lips tore through the mansion's oppressive silence upstairs.
created_at
"2026-02-25T01:16:32.621Z"
2/25/2026, 1:16:32 AM
model
"google/gemini-2.5-flash"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1202
moderation_latency
(null)
generation_time
6909
tokens_prompt
46
tokens_completion
870
native_tokens_prompt
38
native_tokens_completion
1430
native_tokens_completion_images
0
native_tokens_reasoning
1182
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
0.0035864
router
(null)
provider_responses
0
endpoint_id
"16c01e26-9b91-4d22-b487-ed35634b017d"
is_byok
false
latency
1202
model_permaslug
"google/gemini-2.5-flash"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771982192-j6qhxphYbQJqFXzqFEv8"
upstream_id
(null)
total_cost
0.0035864
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
5.53%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
16
1
17
2
16
3
16
4
17
5
17
6
19
7
17
8
16
9
15
10
17
11
15