Run: 2026-09-25-01M3CKHVRVYA33SYFHSNZCXF1R

Run Details

Duration:
2.8s
Cost:
$0.002034
Provider:
Mistral

Evaluation summary

Score Evaluator
Details Link
51.23% 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 library fell silent as the clock struck midnight with an eerie, echoing chime through the dusty halls. Detective Harlow adjusted his coat, eyes scanning the shadowed shelves where secrets lurked behind gilded spines and timeworn leather. A single candle flickered on the mahogany desk, casting long, trembling shadows across the scattered papers and half-empty glass. The victim lay sprawled near the fireplace, a silver letter opener buried deep in his chest, his face frozen in shock. Blood pooled darkly on the Persian rug, its intricate patterns now marred by the slow, creeping stain of violence. Footsteps echoed faintly from the upper balcony, but no one appeared when Harlow called out into the suffocating stillness. The air smelled of old books, cigar smoke, and something metallic that clung to the back of his throat. A torn page from a rare manuscript fluttered to the floor, its edges singed as if hastily ripped from a burning book. Harlow knelt beside the body, noticing a single monogrammed cufflink clutched tightly in the dead man’s stiffened fingers. The library doors were locked from the inside, yet the window latch hung open, swaying gently in the cold night breeze.
created_at"2026-09-25T15:39:42.24Z" 9/25/2026, 3:39:42 PM
model"mistralai/mistral-medium-3.5-20260430"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency385
moderation_latency(null)
generation_time2816
tokens_prompt46
tokens_completion308
native_tokens_prompt51
native_tokens_completion261
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
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num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
service_tier"default"
usage0.002034
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790350782-v6WXwKrXqnZIJ9DPbslk"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790350782-DhtDHOGpXxJLsYQOWxY8"
upstream_id"53225cc6ce0447e8a2e088ac24b78dbf"
provider_responses
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endpoint_id"38ef23a9-5cb3-46fa-85ec-7aed174f04eb"
id"53225cc6ce0447e8a2e088ac24b78dbf"
is_byokfalse
latency385
model_permaslug"mistralai/mistral-medium-3.5-20260430"
provider_name"Mistral"
status200
total_cost0.002034
cache_discount(null)
upstream_inference_cost0
provider_name"Mistral"
response_cache_source_id(null)
data_region"global"
workspace_id"97e315e5-d303-487d-83c1-83180e8a13d4"

Evaluation details

Result Evaluator Details Meta Data
51.23% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
019
119
219
321
419
519
619
722
818
921