Run: 2026-10-07-01M4AVNVCM1YACG4QJR4GV5263

Run Details

Model:
Mistral Medium 3.5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.5s
Cost:
$0.001089
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. Footsteps creaked on the staircase, but no one appeared, leaving only the scent of lavender and the faintest whisper of a name.
created_at"2026-10-07T09:38:54.493Z" 10/7/2026, 9:38:54 AM
model"mistralai/mistral-medium-3.5-20260430"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency260
moderation_latency(null)
generation_time1499
tokens_prompt46
tokens_completion159
native_tokens_prompt51
native_tokens_completion135
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)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
service_tier"default"
usage0.001089
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791365934-xHevFE2JU6IDwOp3egsT"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791365934-xXEGToB1eaG3UAWhPg9b"
upstream_id"19398d669c47404a8abeb582b2080a47"
provider_responses
0
endpoint_id"d21d316f-d540-4718-b36e-3beff85d0cf9"
id"19398d669c47404a8abeb582b2080a47"
is_byokfalse
latency260
model_permaslug"mistralai/mistral-medium-3.5-20260430"
provider_name"Mistral"
status200
total_cost0.001089
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
sentences5
wordCounts
019
119
219
321
422