Run: 2026-07-25-01KYCQWCFGSP44YH0H50R773MA

Run Details

Duration:
24.7s
Cost:
$0.056750
Provider:
Amazon Bedrock

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 on Ashgrove Manor since midnight, and by dawn the gravel drive resembled a shallow river. Constable Merrick arrived first, boots sinking, notebook already damp, wondering why a wealthy man would die on his own birthday. The housekeeper met him beneath the portico, wringing her apron, her thin face the exact colour of unbaked bread dough. She said nothing at all, only pointed down the corridor toward the library, where the heavy door stood half open. Inside, Sir Edmund Vale sat upright in his reading chair, eyes open, one hand curled around a silver fountain pen. A dark stain had spread across his waistcoat, and the unfinished letter beneath his fingers bore only three legible words. Merrick leaned closer, careful not to touch anything, and read the shaky message aloud twice: forgive me, she knew everything. Behind him, upstairs, a floorboard creaked once, then fell silent, and the young constable slowly realised he was not alone. Somewhere in that great sleeping house, a killer was still listening, waiting patiently for the endless storm to finally end.
created_at"2026-07-25T13:36:52.219Z" 7/25/2026, 1:36:52 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4164
moderation_latency(null)
generation_time24499
tokens_prompt46
tokens_completion653
native_tokens_prompt60
native_tokens_completion2258
native_tokens_completion_images(null)
native_tokens_reasoning379
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"
usage0.05675
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNsAnxKSeXMBKWFGQbLt"
is_byokfalse
latency1560
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-1784986612-POHjhi6RbAMIbjWhIrpJ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784986612-POA6GPEypDKBM5uJelpn"
upstream_id"msg_011CdNsAnxKSeXMBKWFGQbLt"
total_cost0.05675
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
100.00% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
020
120
220
320
420
520
620
720
820