Run: 2026-09-29-01M3P2D30VR43ZFN54SC9Z907A

Run Details

Duration:
17.6s
Cost:
$0.022184
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
The fog rolled over Blackwood Manor like a burial shroud, swallowing the gardens and muffling everything except the distant bells. Inspector Ada Verrin stepped from her car at midnight, pulled her collar tight, and studied the lit windows above her. Constable Hayes met her at the door, trembling, and whispered that Lord Ashcombe was found dead in his locked study. The room smelled of bitter almonds and old leather, and the victim sat slumped behind his desk, hand still outstretched. Beside his fingers lay a shattered teacup, and on the blotter someone had scrawled one shaky name in ink: Marguerite. Ada scanned the silent room, certain that the killer stood somewhere beneath this roof, waiting quietly for her to begin.
created_at"2026-09-29T07:52:24.353Z" 9/29/2026, 7:52:24 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3767
moderation_latency(null)
generation_time17592
tokens_prompt46
tokens_completion558
native_tokens_prompt62
native_tokens_completion2206
native_tokens_completion_images(null)
native_tokens_reasoning1950
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"
usage0.022184
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668344-jEPRjPzKNy5abe072SIO"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668344-O5s7Eg4NotjlLQaR0wIJ"
upstream_id"msg_011CfXNHhAbzEqZ4LoyNxRks"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNHhAbzEqZ4LoyNxRks"
is_byokfalse
latency629
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.022184
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
sentences6
wordCounts
020
120
220
320
420
520