Run: 2026-07-25-01KYCPPM5W7R5SPVM5ZZZFRJDA

Run Details

Duration:
11.8s
Cost:
$0.012800
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 Ashcombe Manor for three days, and nobody thought to question why the gates stayed locked. Detective Inspector Marlowe Vance arrived at half past six, her boots sinking into gravel that smelled faintly of iron and rot. A young constable met her beneath the portico, holding an umbrella badly, his face the color of old candle wax. "Library, ma'am," he said, and then he said nothing else, because his throat closed around whatever description he had rehearsed. She walked past him without answering, because she had learned that silence made witnesses talk sooner than any question would. The hallway held forty-one portraits, and every painted eye seemed angled toward the same oak door at the corridor's cold end. Inside, the fire still burned, which meant somebody had fed it within the hour, long after the screaming reportedly stopped. Lord Ashcombe sat upright in his reading chair, hands folded, spectacles clean, a silver letter opener buried beneath his left collarbone. There was no blood on the carpet, none on his shirt, and none, remarkably, on the blade's exposed and polished handle. Vance crouched, studied the angle, and understood immediately that the old man had been arranged here rather than killed here. Behind her, the constable finally spoke: "The family's waiting in the drawing room, ma'am, all six of them, since midnight apparently." "Since midnight," she repeated, glancing at the clock, which had stopped at four, its hands frozen like a small accusation.
created_at"2026-07-25T13:16:14.916Z" 7/25/2026, 1:16:14 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
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cancelledfalse
latency2867
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generation_time11660
tokens_prompt46
tokens_completion387
native_tokens_prompt60
native_tokens_completion500
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native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
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web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.0128
router(null)
provider_responses
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endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNqba3ePLsyQhAXg9FiC"
is_byokfalse
latency2867
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-1784985374-n4KlRwO6gRVcvCgfNlOl"
session_id(null)
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api_type"completions"
id"gen-1784985374-tGqwTG7gzPL2GusT85Fl"
upstream_id"msg_011CdNqba3ePLsyQhAXg9FiC"
total_cost0.0128
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
sentences12
wordCounts
021
121
220
320
420
521
620
721
821
920
1021
1120