Run: 2026-07-25-01KYCRFK5GHM45TVNDVVPHH0TG

Run Details

Duration:
32.9s
Cost:
$0.076575
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 Ashcombe since Tuesday, and by Friday morning the river had swallowed the old footbridge. Detective Inspector Nora Vale parked beside the churchyard wall and sat there listening to water drum against the car roof. Somebody had found a body in the flooded meadow, and somebody else had already told every soul in the village. Twenty umbrellas crowded the narrow lane above the still water, black and shining like beetles gathered around something newly dead. Nora pushed through them, holding up her warrant card, saying nothing, and the wet murmuring closed up behind her again. The dead man lay face up in eight inches of brown water, wearing a good dinner jacket and no shoes. His hands were folded on his chest, arranged, as though someone had truly wanted him to look properly at peace. Nora crouched, feeling the cold seep through her trousers, and studied the very small neat hole above his left eyebrow. Behind her, a young constable said the name Edward Ashcombe aloud, and the whole village seemed to hold its breath. Rain kept falling, patient and thorough, washing away whatever evidence the killer had carelessly left behind in the wet grass.
created_at"2026-07-25T13:47:21.658Z" 7/25/2026, 1:47:21 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3857
moderation_latency(null)
generation_time32782
tokens_prompt46
tokens_completion752
native_tokens_prompt60
native_tokens_completion3051
native_tokens_completion_images(null)
native_tokens_reasoning449
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"
usage0.076575
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNsyBbNmhriXvDKNRnsM"
is_byokfalse
latency1283
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-1784987241-uRJbnsDi80SolGHumCO7"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784987241-RR8qygpkh2TAHBWseasd"
upstream_id"msg_011CdNsyBbNmhriXvDKNRnsM"
total_cost0.076575
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
sentences10
wordCounts
020
120
220
320
420
520
620
720
820
920