Run: 2026-04-25-01KQ2E3320X7W9W07S90BCJ9TY

Run Details

Model:
DeepSeek V4 Flash (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1m 14s
Cost:
$0.001538
Provider:
DeepSeek

Evaluation summary

Score Evaluator
Details Link
100.00% 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 rain lashed against the windows as the grandfather clock struck twelve in the dark library where the body lay. A single bullet hole marred her temple, and a red rose lay beside her outstretched hand on the cold floor. Detective Harris knelt and examined the scene, noting the absence of any struggle marks on the floor around the body.
created_at"2026-04-25T13:43:29.094Z" 4/25/2026, 1:43:29 PM
model"deepseek/deepseek-v4-flash-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency654
moderation_latency(null)
generation_time71243
tokens_prompt46
tokens_completion4216
native_tokens_prompt39
native_tokens_completion5472
native_tokens_completion_images(null)
native_tokens_reasoning5402
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"
usage0.00153762
router(null)
provider_responses
0
endpoint_id"722e0746-2034-4d6e-a08f-e6271849ee9e"
id"6c0ebbbd-d630-48b5-9900-48839695b4f7"
is_byokfalse
latency284
model_permaslug"deepseek/deepseek-v4-flash-20260423"
provider_name"DeepSeek"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777124610-HD1Is86OeaBLXARVoStD"
session_id(null)
api_type"completions"
id"gen-1777124610-hEePbI7Xmzcp4syxnbes"
upstream_id"6c0ebbbd-d630-48b5-9900-48839695b4f7"
total_cost0.00153762
cache_discount(null)
upstream_inference_cost0
provider_name"DeepSeek"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences3
wordCounts
020
120
220