Run: 2026-02-20-01KHXQJN5QSEZ2EPX6RF02BJ0M

Run Details

Duration:
4.6s
Cost:
$0.000510
Provider:
Mistral

Evaluation summary

Score Evaluator
Details Link
33.83% 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 gabled windows watching like hollow eyes filled with forgotten secrets. Detective Harlan Mercer adjusted his coat, the gravel crunching beneath his boots as he approached the wrought-iron gates. A single raven perched on the fence post, its glossy feathers ruffled by the wind that carried whispers of impending doom. Inside, the air smelled of aged leather and lavender, though something metallic lingered just beneath the surface. Lady Whitmore stood by the fireplace, her trembling fingers clutching a monogrammed handkerchief stained with something dark. The butler’s polished shoes clicked against the marble floor as he announced the detective’s arrival with practiced indifference. A shattered teacup lay near the hearth, its delicate fragments scattered like the last remnants of a shattered alibi. Mercer noticed the portrait above the mantel—Sir Reginald’s piercing gaze seemed to follow him, cold and unblinking. The clock in the hallway struck midnight, its brass pendulum swinging like the blade of a guillotine over them all. Footsteps echoed from the upper landing, but when Mercer turned, the staircase stood empty, draped in heavy silence.
created_at"2026-02-20T14:34:35.072Z" 2/20/2026, 2:34:35 PM
model"mistralai/mistral-medium-3.1" 3/1/2001, 12:00:00 AM
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency618
moderation_latency(null)
generation_time4468
tokens_prompt46
tokens_completion320
native_tokens_prompt39
native_tokens_completion247
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"
usage0.0005096
router(null)
provider_responses
0
endpoint_id"13c5002b-8c5b-490c-8a5f-52ec0242804f"
id"7deaf09295174df48807d32e429f41e8"
is_byokfalse
latency618
model_permaslug"mistralai/mistral-medium-3.1" 3/1/2001, 12:00:00 AM
provider_name"Mistral"
status200
api_type"completions"
id"gen-1771598075-SJZFuv5DLYzZuFmW74JM"
upstream_id"7deaf09295174df48807d32e429f41e8"
total_cost0.0005096
cache_discount(null)
upstream_inference_cost0
provider_name"Mistral"

Evaluation details

Result Evaluator Details Meta Data
33.83% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
018
119
221
317
417
518
619
718
820
918