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Run: 2026-02-20-01KHXQDRCFQTCDZEPC6CZRYW0Y
Run Details
Model:
Mistral Medium 3.1
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
4.4s
Cost:
$0.000570
Provider:
Mistral
Evaluation summary
Score
Evaluator
Details Link
67.75%
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 Harlan Mercer adjusted his damp trench coat, eyes scanning the gravel drive where footprints vanished into the rain-slicked night. A single candle flickered in the foyer, casting long shadows over the portrait of Lord Blackwood, his smile now sinister. Lady Blackwood stood rigid in her velvet gown, clutching a silver locket that trembled against her pale, unnaturally still fingers. The butler’s voice cracked as he whispered, "The master is in the library—unchanged since the clock struck midnight last evening." Mercer pushed open the heavy oak doors, the scent of cigar smoke and something metallic hanging thick in the oppressive silence. Lord Blackwood sat slumped in his leather chair, a crystal glass shattered beside him, his face frozen in eternal surprise. Blood pooled darkly on the Persian rug, its edges creeping toward the fireplace where embers glowed like accusing eyes. A single playing card—the Ace of Spades—was tucked into the dead man’s waistcoat, its edges slightly singed by unseen flames. Mercer knelt, gloved fingers brushing the card, as the wind howled through broken windows like a mournful, warning dirge.
created_at
"2026-02-20T14:31:54.522Z"
2/20/2026, 2:31:54 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
242
moderation_latency
(null)
generation_time
4286
tokens_prompt
46
tokens_completion
338
native_tokens_prompt
39
native_tokens_completion
277
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
0.0005696
router
(null)
provider_responses
0
endpoint_id
"13c5002b-8c5b-490c-8a5f-52ec0242804f"
id
"5315782f40a54bd98234faa1e47b106c"
is_byok
false
latency
241
model_permaslug
"mistralai/mistral-medium-3.1"
3/1/2001, 12:00:00 AM
provider_name
"Mistral"
status
200
api_type
"completions"
id
"gen-1771597914-2pEFEnwfLugMoY3VnDlS"
upstream_id
"5315782f40a54bd98234faa1e47b106c"
total_cost
0.0005696
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Mistral"
Evaluation details
Result
Evaluator
Details
Meta Data
67.75%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
19
1
21
2
20
3
20
4
21
5
21
6
20
7
19
8
22
9
19