NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-20-01KHXPHB71MBYW820B9KG61CGY
Run Details
Model:
Mistral Medium 3.1
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.6s
Cost:
$0.000544
Provider:
Mistral
Evaluation summary
Score
Evaluator
Details Link
64.95%
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 Harlow adjusted his cufflinks, watching the butler’s stiff posture betray something unseen beneath his polished demeanor. A scream shattered the silence just as the clock struck midnight, echoing through halls lined with portraits of dead ancestors. Lady Whitmore clutched her pearls, her trembling voice whispering about the missing diamond brooch last seen around her nephew’s throat. The study door creaked open, revealing a body sprawled across the Persian rug, a single playing card clutched in its lifeless fingers. Inspector Graves knelt beside the victim, noting the scent of bitter almonds lingering near the half-empty glass of brandy. A shadow darted past the hallway mirror, but when Harlow turned, only the flicker of dying candles answered his sharp inquiry. The guests exchanged glances, each face a mask of innocence, though one pair of hands trembled just slightly too much. Outside, thunder rolled as the detective’s gaze settled on the grand fireplace, where a charred letter’s edge curled into ash. Somewhere in the house, a floorboard groaned under cautious footsteps, while the storm erased any trace of who had come or gone.
created_at
"2026-02-20T14:16:23.533Z"
2/20/2026, 2:16:23 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
247
moderation_latency
(null)
generation_time
4512
tokens_prompt
46
tokens_completion
340
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
"f86d7ee7202c469a9171105f0d8f9518"
is_byok
false
latency
247
model_permaslug
"mistralai/mistral-medium-3.1"
3/1/2001, 12:00:00 AM
provider_name
"Mistral"
status
200
api_type
"completions"
id
"gen-1771596983-sFy8fungTVlghV05FmCi"
upstream_id
"f86d7ee7202c469a9171105f0d8f9518"
total_cost
0.0005436
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Mistral"
Evaluation details
Result
Evaluator
Details
Meta Data
64.95%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
19
1
17
2
20
3
20
4
22
5
20
6
21
7
20
8
20
9
22