Run: 2026-10-08-01M4DAMYE14D1BES557JC897K7

Run Details

Duration:
12.5s
Cost:
$0.001264
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
93.44% 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 fallen across Blackwood Manor since midnight, washing the gravel paths clean of every single footprint left behind. Detective Inspector Harold Finch arrived at dawn, his umbrella dripping onto the cold marble steps of the grand entrance hall. Lady Vivienne Ashworth lay motionless beside the fireplace, one hand still clutching a half-empty crystal glass of rare vintage sherry. Nobody in the household had heard a scream, and every guest swore they had been sound asleep in their beds. Finch knelt beside the body, noticing three oddities: a muddy boot, a torn letter, and one missing silver key. Somewhere above, a door creaked open, and footsteps began descending the long oak staircase slowly, deliberately, toward the hall below.
created_at"2026-10-08T08:39:02.345Z" 10/8/2026, 8:39:02 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2614
moderation_latency(null)
generation_time12463
tokens_prompt46
tokens_completion473
native_tokens_prompt62
native_tokens_completion2515
native_tokens_completion_images(null)
native_tokens_reasoning2253
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"
usage0.0012637
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448742-d8KJJZ1m66MJKdhnwQiY"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448742-RYZsCTLqWEYHddNbSPBj"
upstream_id"msg_011CfpU8C1vNRPoYqEzeqYoc"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpU8C1vNRPoYqEzeqYoc"
is_byokfalse
latency805
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0012637
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
93.44% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
120
220
320
419
520