Run: 2026-07-25-01KYCPR47X1Z9Y0XT45W3K8NX5

Run Details

Duration:
10.2s
Cost:
$0.010250
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
96.07% 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 stopped by the time Inspector Halloway arrived, leaving the gravel drive slick and glittering under weak lamplight. Blackthorn House loomed above him, its seventeen windows dark except one, where a curtain twitched and then fell perfectly still. He climbed the steps slowly, counting them out of habit, and found the front door standing open exactly four inches. Inside, the hall smelled of beeswax, wet wool, and something faintly metallic that made the back of his throat tighten. A grandfather clock ticked in the corner, and beside it a woman sat rigid on a chair, holding someone's gloves. "You'll be the detective," she said, not looking up, her voice as flat and gray as the flagstones beneath them. "He's in the library, and I want it understood that nobody here has touched anything at all since half-past nine." Halloway removed his hat, noting the mud on her hem, the tremor in her hands, the absence of any tears. "And you would be?" he asked, though he already suspected, from the ring she kept turning, exactly who she was. She raised her eyes then, pale as winter water, and answered, "I'm his wife, Inspector. I'm the one who found him."
created_at"2026-07-25T13:17:04.13Z" 7/25/2026, 1:17:04 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2664
moderation_latency(null)
generation_time10122
tokens_prompt46
tokens_completion299
native_tokens_prompt60
native_tokens_completion398
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"
usage0.01025
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNqfDNYrgG7QxvPNw2oV"
is_byokfalse
latency2450
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-1784985424-A8hM2xWuVwMHjGT3VKqC"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784985424-qQXwjMGYF6Gm1it8W2P1"
upstream_id"msg_011CdNqfDNYrgG7QxvPNw2oV"
total_cost0.01025
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
96.07% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
020
120
220
320
420
520
620
720
820
921