Run: 2026-10-08-01M4DAHKNZFJJ28KDJTPMDG47R

Run Details

Duration:
8.4s
Cost:
$0.001091
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 hammered against the windows of Blackwood Manor as the clock struck midnight, and nobody noticed the terrified scream. Inspector Eleanor Hart stood in the foyer, her wet coat dripping onto the marble floor while nervous constables shouted orders. Lord Edmund Blackwood lay sprawled across the Persian rug in the library, a silver letter opener protruding from his chest. Hart knelt beside the body, noting the untouched brandy, the overturned chair, and muddy footprints leading toward the servants' staircase. Someone had wiped the library clean, yet one small, deliberately overlooked detail refused to stay hidden beneath the mahogany desk. Hart pulled out a crumpled lace handkerchief, its faint scent of lavender suggesting the killer had not been a man. Across the hallway, the widow Margaret Blackwood watched from the stairs, her eyes fixed on the detective with unmistakable fear. Hart folded the handkerchief into an evidence bag, certain that Margaret knew exactly who had walked through that door tonight.
created_at"2026-10-08T08:37:13.03Z" 10/8/2026, 8:37:13 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency7607
moderation_latency(null)
generation_time8410
tokens_prompt46
tokens_completion257
native_tokens_prompt62
native_tokens_completion2170
native_tokens_completion_images(null)
native_tokens_reasoning1810
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"
usage0.0010912
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448633-fYVqkyUbVXbSyOze6sFc"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448633-IftlSHbpoDb7IEEelXZR"
upstream_id"msg_011CfpTz8VNCny3vYWb7wZ3v"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTz8VNCny3vYWb7wZ3v"
is_byokfalse
latency724
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0010912
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