Run: 2026-09-23-01M37Q034SEXMP7W1DR0DQYC4F

Run Details

Duration:
18.3s
Cost:
$0.035808
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 been falling over Blackmere Manor for three days when the butler discovered the body in the library. Lord Edmund Ashworth lay slumped across his mahogany desk, a silver letter opener buried deep between his broad shoulder blades. Old Hobbs stood frozen in the doorway, his candle trembling, as thunder rolled across the moors like distant cannon fire. Within the hour, every guest had been summoned to the drawing room, where the dying fire burned low and uneasy. Inspector Margaret Hale studied each face carefully, knowing that somewhere among these seven elegant strangers sat a patient, cold-blooded killer. "Nobody leaves this house tonight," she announced quietly, and the widow in black let her teacup shatter upon the floor. Hale noticed, of course, that the woman's hands had been shaking long before anyone had even mentioned the word murder.
created_at"2026-09-23T18:03:42.121Z" 9/23/2026, 6:03:42 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4435
moderation_latency(null)
generation_time18255
tokens_prompt46
tokens_completion436
native_tokens_prompt62
native_tokens_completion1778
native_tokens_completion_images(null)
native_tokens_reasoning1484
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"
usage0.035808
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186622-QnQpA8coN5DonTZg7lfG"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186622-aipeKjl4iqHmUh0uAXdi"
upstream_id"msg_011CfLp3skBmHTNbMGKWAbqj"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLp3skBmHTNbMGKWAbqj"
is_byokfalse
latency1164
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.035808
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