Run: 2026-09-29-01M3P2EX0FYCKX74YAJ5Y6SH7V

Run Details

Duration:
14.8s
Cost:
$0.022994
Provider:
Claude Platform on AWS

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
Rain hammered the windows of Blackwood Manor the night Lord Aldrich Pemberton was discovered dead in his locked private study. Inspector Mara Quinn arrived at midnight, her boots soaked, her patience thinner than the cheap umbrella she had abandoned outside. Seven guests huddled in the drawing room, each wearing the same pale expression of people who had rehearsed their innocence. The butler, a stooped man named Hollis, led her upstairs without speaking, his candle trembling against the long, crawling shadows. Lord Pemberton lay slumped across his desk, one hand outstretched toward a teacup that still steamed faintly in the lamplight. Quinn noticed three things immediately: the bolted door, the open window, and the dry floor beneath it despite the storm. She knelt beside the body and caught a bitter almond scent that made her stomach tighten with old, familiar dread. Behind her, Hollis cleared his throat and whispered that the master had received a mysterious, unsigned letter just before dinner. Quinn rose, studied the ashes smoldering in the fireplace, and found one scorched corner of paper bearing a single initial. Downstairs, someone screamed, and the entire manor plunged into darkness, as though the house itself wanted to keep its secrets.
created_at"2026-09-29T07:53:23.733Z" 9/29/2026, 7:53:23 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3866
moderation_latency(null)
generation_time14812
tokens_prompt46
tokens_completion554
native_tokens_prompt62
native_tokens_completion2287
native_tokens_completion_images(null)
native_tokens_reasoning1857
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"end_turn"
service_tier"default"
usage0.022994
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668403-MdKMH33aLnVlo4i9yF2s"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668403-cAaBLL0uiAWh8bL5PzES"
upstream_id"msg_011CfXNN55LGmiQtV56TyMn6"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNN55LGmiQtV56TyMn6"
is_byokfalse
latency676
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.022994
cache_discount(null)
upstream_inference_cost0
provider_name"Claude Platform on AWS"
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
sentences10
wordCounts
020
120
220
320
420
520
620
720
820
920