Run: 2026-09-23-01M37PTYM2DF4ARH5277RE2TA8

Run Details

Duration:
19.3s
Cost:
$0.037968
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 storm had been raging over Blackwood Manor for three days when the butler finally discovered the lifeless body upstairs. Lord Edmund Harrow lay slumped across his mahogany desk, a silver letter opener buried deep between his broad shoulder blades. Candles had burned down to nothing, leaving only the cold gray light of dawn creeping through the tall arched windows. Jenkins, who had served the family faithfully for forty years, dropped his tray and let out a strangled, horrified cry. Within minutes, the remaining guests had gathered in the narrow doorway, their faces pale and their eyes wide with fear. Nobody could leave, because the only bridge connecting the island to the mainland had collapsed during the night's violent storm. Detective Clara Voss stepped forward, studying the room with the patient attention of someone who expected to be lied to. She noticed the untouched glass of brandy, the overturned chair, and the muddy footprints leading toward the locked balcony door. "One of you killed him," she said, "and before this storm ends, I promise you I will know exactly who."
created_at"2026-09-23T18:00:53.649Z" 9/23/2026, 6:00:53 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3704
moderation_latency(null)
generation_time19283
tokens_prompt46
tokens_completion539
native_tokens_prompt62
native_tokens_completion1886
native_tokens_completion_images(null)
native_tokens_reasoning1530
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"
usage0.037968
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186453-n0iAl5x91fGwix11Pcmg"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186453-oIPn5xo7qHq9nKVYkeJM"
upstream_id"msg_011CfLoqTP93cXVqy9VZmegy"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLoqTP93cXVqy9VZmegy"
is_byokfalse
latency1112
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.037968
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
sentences9
wordCounts
020
120
220
320
420
520
620
720
820