NC Bench
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Run: 2026-02-19-01KHVPGHMWT0P2FPXFJ4WDV77S
Run Details
Model:
Gemini 3.1 Pro (Preview)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
47.0s
Cost:
$0.062536
Provider:
Google AI Studio
Evaluation summary
Score
Evaluator
Details Link
100.00%
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
Heavy rain hammered violently against the stained glass windows of the grand manor as midnight struck the grandfather clock downstairs. Detective Miller walked very slowly toward the dimly lit library because somebody reported a terrible scream echoing through the halls. He pushed open the thick wooden doors and immediately saw Lord Harrington lying perfectly flat on the expensive Persian carpet. A silver dagger protruded deeply from his chest while a pool of crimson blood quietly soaked the delicate carpet fibers. Miller knelt beside the cold corpse taking note of a crumpled piece of parchment clutched tightly in the frail fingers. He carefully extracted the secret note discovering a cryptic message written hastily with strange dark ink that resembled fresh blood. Five guests remained trapped inside this isolated mansion because the massive stone bridge outside had totally surrendered to rapid floodwaters. One of those seemingly innocent and terrified individuals was actually a ruthless killer hiding behind a mask of profound grief. Thunder echoed loudly overhead causing the flickering lights to completely fail just as a floorboard creaked directly behind the detective. He slowly reached toward his loaded revolver anticipating an immediate attack from whatever malicious creature lurked within the oppressive shadows.
created_at
"2026-02-19T19:37:28.309Z"
2/19/2026, 7:37:28 PM
model
"google/gemini-3.1-pro-preview-20260219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3107
moderation_latency
(null)
generation_time
46505
tokens_prompt
46
tokens_completion
1723
native_tokens_prompt
38
native_tokens_completion
5205
native_tokens_completion_images
0
native_tokens_reasoning
4988
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
0.062536
router
(null)
provider_responses
0
endpoint_id
"2abf5677-0826-45d9-8470-3d62c31d54a1"
is_byok
false
latency
3107
model_permaslug
"google/gemini-3.1-pro-preview-20260219"
provider_name
"Google AI Studio"
status
200
api_type
"completions"
id
"gen-1771529848-JzGoMKA6YyxDgBwPsg1D"
upstream_id
(null)
total_cost
0.062536
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Google AI Studio"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20