Run: 2026-10-07-01M4AVHVJFP7NGRD2G10HN5SSW

Run Details

Duration:
3.0s
Cost:
$0.002319
Provider:
Mistral

Evaluation summary

Score Evaluator
Details Link
29.90% 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 crimson stain blooming across his waistcoat like a grotesque, unfolding rose in the firelight. His monocle had rolled beneath the chair, glinting coldly as it caught the dim light, a silent witness to the night’s brutal events. A faint scent of lavender and gunpowder hung in the air, mingling with the metallic tang of blood and old parchment. Harlow knelt, his gloved fingers brushing the edge of a torn letter, its ink smeared as if by a hurried, trembling hand. The butler stood rigid by the door, his pale face betraying nothing, though his knuckles whitened around the silver tray he clutched. Outside, the wind howled through the oak trees, rattling the windows like a ghost demanding entry to the grim, unfolding drama within. Somewhere in the house, a floorboard creaked, and Harlow’s pulse quickened, knowing the killer might still be watching, waiting, hidden in plain sight.
created_at"2026-10-07T09:36:43.608Z" 10/7/2026, 9:36:43 AM
model"mistralai/mistral-medium-3.5-20260430"
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latency298
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generation_time2936
tokens_prompt46
tokens_completion336
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native_tokens_completion299
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native_tokens_reasoning0
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num_media_completion0
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origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
service_tier"default"
usage0.002319
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
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request_id"req-1791365803-HbGv8fs9DJEGBq4azC8Y"
session_id(null)
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api_type"completions"
id"gen-1791365803-X9ZhywoyyNcfjq3JyjAk"
upstream_id"ab32811bd276477387ae3221682bb96d"
provider_responses
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endpoint_id"d21d316f-d540-4718-b36e-3beff85d0cf9"
id"ab32811bd276477387ae3221682bb96d"
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latency289
model_permaslug"mistralai/mistral-medium-3.5-20260430"
provider_name"Mistral"
status200
total_cost0.002319
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
29.90% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
019
119
219
322
423
521
622
722
822
923