NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-20-01KHXQBNGJHX308J3G92PKH4XD
Run Details
Model:
Mistral Medium 3.1
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.7s
Cost:
$0.000576
Provider:
Mistral
Evaluation summary
Score
Evaluator
Details Link
63.03%
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 gilded gates creaking ominously as thunder rolled across the desolate moors. Detective Harlow adjusted his damp trench coat, eyes narrowing at the flickering candlelight spilling from shattered second-floor windows. A bloodstained glove lay crumpled beside the marble steps, its leather still warm despite the biting wind whipping through skeletal trees. Inside, the air smelled of lavender and gunpowder, mingling with the metallic tang of something far more sinister lurking unseen. Portraits of the deceased family watched silently as Harlow’s boots echoed against the black-and-white checkerboard tiles of the foyer. The butler’s hands trembled slightly while offering a silver tray bearing a single, half-empty glass of bourbon and ice. A woman’s stifled sob came from the library, where shattered crystal glittered like stars beneath the overturned mahogany desk. Harlow’s fingers brushed the cold barrel of his revolver, sensing the weight of secrets pressing down like the estate’s crumbling stone walls. The grandfather clock struck midnight just as a shadow darted past the hallway, its edges blurring into the flickering gaslight’s eerie glow. Somewhere above, a floorboard groaned under unseen footsteps, each creak a whisper of the violence that had unfolded hours before.
created_at
"2026-02-20T14:30:46.046Z"
2/20/2026, 2:30:46 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
245
moderation_latency
(null)
generation_time
4584
tokens_prompt
46
tokens_completion
354
native_tokens_prompt
39
native_tokens_completion
280
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
0.0005756
router
(null)
provider_responses
0
endpoint_id
"13c5002b-8c5b-490c-8a5f-52ec0242804f"
id
"6b15ce460c9743489e94c8e331259d84"
is_byok
false
latency
245
model_permaslug
"mistralai/mistral-medium-3.1"
3/1/2001, 12:00:00 AM
provider_name
"Mistral"
status
200
api_type
"completions"
id
"gen-1771597846-knPFq2BAnongt39mctZO"
upstream_id
"6b15ce460c9743489e94c8e331259d84"
total_cost
0.0005756
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Mistral"
Evaluation details
Result
Evaluator
Details
Meta Data
63.03%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
19
1
19
2
21
3
20
4
21
5
20
6
19
7
22
8
22
9
20