Run: 2026-09-23-01M37P098A0JMACAMDD251WGR5

Run Details

Duration:
21.2s
Cost:
$0.045528
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 knocked out the power at Blackwood Manor just before midnight, leaving the guests stranded in complete darkness. Candles flickered along the grand hallway as Inspector Eleanor Vance descended the staircase, her footsteps echoing against the cold marble. She had come to the manor for a quiet weekend, but quiet weekends never seemed to last long for her. A scream suddenly pierced the silence, sharp and terrible, rising from somewhere behind the heavy oak doors of the library. Eleanor ran toward the sound, pushing past the trembling butler who stood frozen in the doorway with a silver candlestick. Inside, Lord Ashford lay slumped across his leather armchair, his eyes wide open and a dark stain spreading beneath him. His young wife, Margaret, knelt beside the body, sobbing uncontrollably while clutching a crumpled letter tightly in her shaking hand. Eleanor noticed that every window was bolted from the inside, and the fireplace grate had been sealed for many years. Behind her, the other guests gathered in hushed confusion, each face pale in the candlelight, each one a possible killer. Eleanor turned slowly to face them and said, "Nobody leaves this house until I find out who did this tonight."
created_at"2026-09-23T17:46:19.804Z" 9/23/2026, 5:46:19 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4935
moderation_latency(null)
generation_time21171
tokens_prompt46
tokens_completion633
native_tokens_prompt62
native_tokens_completion2264
native_tokens_completion_images(null)
native_tokens_reasoning1846
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"
usage0.045528
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790185579-YlVFC4E7u2TbPYCkZkbK"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790185579-d1tHiqQkO1YWDTITzwha"
upstream_id"msg_011CfLnj3fb9VWPwND2tdFNB"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLnj3fb9VWPwND2tdFNB"
is_byokfalse
latency1375
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.045528
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