NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-20-01KHXPR4RGJD5X5JW2AT05DW3P
Run Details
Model:
Mistral Medium 3.1
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
7.1s
Cost:
$0.000544
Provider:
Mistral
Evaluation summary
Score
Evaluator
Details Link
63.81%
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 estate loomed under storm clouds, its windows flickering with candlelight as guests arrived for dinner that evening. Detective Mercer adjusted his gloves, watching the butler’s stiff posture betray something unseen beneath his polished professional demeanor. A scream shattered the silence just as the clock struck nine, echoing through halls lined with portraits of long-dead ancestors. Lady Whitmore clutched her pearls, her pale face twisting into horror as the chandelier swayed violently above the dining table. Blood pooled around the body sprawled near the fireplace, its edges creeping toward the hearth like fingers reaching for forgotten secrets. The victim’s pocket watch lay shattered on the marble, its hands frozen at the exact moment the murderer struck without warning. Whispers spread like wildfire among the guests, each glance heavy with suspicion as Mercer scanned the room for telltale signs. A single glove, monogrammed with the letter *V*, was tucked beneath the sofa, its leather still warm to the detective’s touch. The air smelled of lavender and gunpowder, a contradiction that lingered as the wind howled through cracks in the ancient mansion. Mercer’s pulse quickened—this was no ordinary crime, but a meticulously planned act of vengeance decades in the making.
created_at
"2026-02-20T14:20:06.298Z"
2/20/2026, 2:20:06 PM
model
"mistralai/mistral-medium-3.1"
3/1/2001, 12:00:00 AM
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
248
moderation_latency
(null)
generation_time
6978
tokens_prompt
46
tokens_completion
345
native_tokens_prompt
39
native_tokens_completion
264
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.0005436
router
(null)
provider_responses
0
endpoint_id
"13c5002b-8c5b-490c-8a5f-52ec0242804f"
id
"c2fe66b3286341f78ddd3e7f4eee1a3e"
is_byok
false
latency
244
model_permaslug
"mistralai/mistral-medium-3.1"
3/1/2001, 12:00:00 AM
provider_name
"Mistral"
status
200
api_type
"completions"
id
"gen-1771597206-mXEEfdZRTmsVsvrYV4yU"
upstream_id
"c2fe66b3286341f78ddd3e7f4eee1a3e"
total_cost
0.0005436
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Mistral"
Evaluation details
Result
Evaluator
Details
Meta Data
63.81%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
19
1
18
2
21
3
20
4
21
5
21
6
20
7
21
8
21
9
19