Run: 2026-07-25-01KYCPNBAYG3EEK53N278JX8M8

Run Details

Duration:
15.8s
Cost:
$0.009525
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
80.33% 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 on Whitmore Hall for three days, turning the gravel drive into a river of mud. Inspector Deborah Vance parked her car beneath the dripping yews and studied the house through her streaked, fogging windshield. Every window on the eastern wing blazed with light, though the hour had crawled well past two in the morning. A young constable met her at the door, his face the color of the wet stone beneath his boots. "He's in the library, ma'am," the boy said, and swallowed hard, unable to look directly at her steady gray eyes. Inside, the house smelled of woodsmoke, old paper, and something faintly metallic that she recognized before she saw anything. Lord Alistair Whitmore lay across his desk with a letter opener buried neatly between his fourth and fifth ribs. Seven people waited in the drawing room, each of them soaked to the skin, and each one telling a different story. None of them had left the estate that night, which meant the killer was still sitting on the velvet furniture. Vance removed her gloves, one finger at a time, and decided that the truth would arrive before the morning did.
created_at"2026-07-25T13:15:33.094Z" 7/25/2026, 1:15:33 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1843
moderation_latency142
generation_time15586
tokens_prompt46
tokens_completion289
native_tokens_prompt60
native_tokens_completion369
native_tokens_completion_images(null)
native_tokens_reasoning0
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"
usage0.009525
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNqYWHM31bxUhiiK1rFt"
is_byokfalse
latency1843
model_permaslug"anthropic/claude-opus-5-20260723"
provider_name"Amazon Bedrock"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer(null)
request_id"req-1784985333-U6e1vndI6lGJ0YPqIj7D"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784985333-vnoLTnudkUG7Aw60z7p1"
upstream_id"msg_011CdNqYWHM31bxUhiiK1rFt"
total_cost0.009525
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
80.33% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
020
119
220
319
420
519
619
721
820
920