Run: 2026-09-29-01M3P2BJ7VX1MYWK26XEX9R6FK

Run Details

Duration:
12.9s
Cost:
$0.018624
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 found dead in his locked private study. Inspector Maren Cole arrived at midnight, soaked and irritated, carrying a battered notebook and very little patience for wealthy families. The butler, pale and trembling, led her down the corridor where portraits of dead ancestors watched every step she took. Pemberton lay slumped across his desk, one hand clutching a broken pocket watch stopped at exactly nine minutes past eleven. The door had been bolted from inside, the window sealed by painted shutters, and one key hung around his neck. Cole knelt beside the body and noticed a faint scent of bitter almonds lingering beside the nearly empty brandy glass. Someone in this house murdered him, she whispered, and everyone beneath its roof had good reason to want him gone.
created_at"2026-09-29T07:51:34.401Z" 9/29/2026, 7:51:34 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4166
moderation_latency(null)
generation_time12836
tokens_prompt46
tokens_completion436
native_tokens_prompt62
native_tokens_completion1850
native_tokens_completion_images(null)
native_tokens_reasoning1563
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"
usage0.018624
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668294-HelQNjH3UtbG4MLTsi7x"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668294-3MppT6alzmlHzm7vK4gc"
upstream_id"msg_011CfXNE1yapLnxBY9Ah8B6V"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNE1yapLnxBY9Ah8B6V"
is_byokfalse
latency770
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.018624
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
sentences7
wordCounts
020
120
220
320
420
520
620