Run: 2026-02-20-01KHXQDRCFQTCDZEPC6CZRYW0Y

Run Details

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

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_id182717
external_user(null)
streamedtrue
cancelledfalse
latency242
moderation_latency(null)
generation_time4286
tokens_prompt46
tokens_completion338
native_tokens_prompt39
native_tokens_completion277
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
usage0.0005696
router(null)
provider_responses
0
endpoint_id"13c5002b-8c5b-490c-8a5f-52ec0242804f"
id"5315782f40a54bd98234faa1e47b106c"
is_byokfalse
latency241
model_permaslug"mistralai/mistral-medium-3.1" 3/1/2001, 12:00:00 AM
provider_name"Mistral"
status200
api_type"completions"
id"gen-1771597914-2pEFEnwfLugMoY3VnDlS"
upstream_id"5315782f40a54bd98234faa1e47b106c"
total_cost0.0005696
cache_discount(null)
upstream_inference_cost0
provider_name"Mistral"

Evaluation details

Result Evaluator Details Meta Data
67.75% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
019
121
220
320
421
521
620
719
822
919