Run: 2026-10-27-01M5YEAA12X5K98863Z3P9W9YD

Run Details

Duration:
18.8s
Cost:
$0.008116
Provider:
OpenAI

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
By the time the first bell rang, the snow had sealed every road leading to Blackthorn Hall and silenced everything. Inside, Detective Mara Vane stood before the library door, listening to a clock tick on the other side without interruption. The housekeeper had found it locked, but its only key lay visible through the keyhole, on the carpet just inside. A dark stain had begun to creep beneath the door, spreading slowly toward the hem of Mara’s borrowed dressing gown. Behind her, the guests gathered in silence, their faces pale and strangely uniform beneath the corridor’s flickering electric wall lamps. Lord Blackthorn’s son broke the quiet first, insisting that his father always worked alone and never admitted visitors after midnight. Mara noticed the fresh scratch across his cheek, then noticed his sister watching her notice it, smiling without any warmth. The butler brought an axe, and the first blow splintered the painted wood but failed to loosen the stubborn lock. On the third strike, the door swung inward, revealing Lord Blackthorn slumped over his desk, a knife in his back. The window was bolted, the fireplace cold, and a second cup of tea still steamed beside the dead man’s hand. Mara stepped inside, avoiding the blood, and saw that someone had written her name across the blotter in red ink. She had never met Lord Blackthorn, but she recognized the handwriting: it belonged to her mother, dead for twelve years.
created_at"2026-10-27T10:25:55.341Z" 10/27/2026, 10:25:55 AM
model"openai/gpt-6.1-terra-20261026"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency16251
moderation_latency(null)
generation_time18519
tokens_prompt46
tokens_completion496
native_tokens_prompt41
native_tokens_completion1615
native_tokens_completion_images0
native_tokens_reasoning1314
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"completed"
service_tier"default"
usage0.008116
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.22.1; linux; x64))"
http_referer(null)
request_id"req-1793096755-7nZ5irxgL1ipmrjc2wyY"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1793096755-gWG5p6tuiQ6I1cFCTQ4i"
upstream_id"resp_0e4b2a253d52ee11016ae07c338dd887d188c7b97bf997ad71"
provider_responses
0
endpoint_id"2d2ad10f-098e-4bbf-aa95-11f705b2b9a2"
id"resp_0e4b2a253d52ee11016ae07c338dd887d188c7b97bf997ad71"
is_byokfalse
latency343
model_permaslug"openai/gpt-6.1-terra-20261026"
provider_name"OpenAI"
status200
total_cost0.008116
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)
data_region"global"
workspace_id"97e315e5-d303-487d-83c1-83180e8a13d4"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences12
wordCounts
020
120
220
320
420
520
620
720
820
920
1020
1120