Run: 2026-09-23-01M37NZB1JJ6XYQ9GVB63SXXAJ

Run Details

Duration:
17.8s
Cost:
$0.034808
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 rain had not stopped for three days when Inspector Clara Voss arrived at the iron gates of Hollow Manor. A single lamp burned in the upstairs window, flickering like a nervous heartbeat against the black and swollen midnight sky. The butler, a gaunt man named Pembrook, opened the door before she could knock and said absolutely nothing at all. He led her down a long corridor lined with portraits whose painted eyes seemed to follow every step she took. In the library, Lord Ashcombe lay slumped across his writing desk, a silver letter opener buried deep in his back. Clara noticed immediately that the fire was still warm, yet every window and door had been locked from the inside. Six guests waited in the drawing room, and each of them, she suspected, had a reason to want him dead. "Nobody leaves this house tonight," Clara announced, removing her soaked leather gloves slowly, "because one of you is a killer."
created_at"2026-09-23T17:45:48.866Z" 9/23/2026, 5:45:48 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5117
moderation_latency(null)
generation_time17789
tokens_prompt46
tokens_completion494
native_tokens_prompt62
native_tokens_completion1728
native_tokens_completion_images(null)
native_tokens_reasoning1423
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"
usage0.034808
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790185548-trLZR6T41npKZxbY7MDk"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790185548-M9ERXMXf0x3hLHNVFY0k"
upstream_id"msg_011CfLngm97UwqV6CuoXqGTj"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLngm97UwqV6CuoXqGTj"
is_byokfalse
latency1281
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.034808
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
sentences8
wordCounts
020
120
220
320
420
520
620
720