Run: 2026-07-01-01KWE8RKJD7FT9BXQWEQM4RXCD

Run Details

Duration:
32.9s
Cost:
$0.042420
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 old mansion stood silent atop the hill, its windows dark, its doors locked tight against curious intruders this night. Detective Sarah Mills arrived just after midnight, stepping slowly and carefully over the rain-soaked gravel driveway toward the wide entrance. A single light flickered faintly in an upstairs window, the only sign that someone inside might still be awake there. The butler, Edmund Hayes, lay motionless at the foot of the grand marble staircase, blood slowly pooling beneath his body. Sarah knelt beside the body, her flashlight tracing the pale, lifeless face frozen in silent, unending terror and cold fear. Whoever had done this terrible thing, she quietly realized, was still somewhere close, watching every careful move she made tonight.
created_at"2026-07-01T07:19:44.985Z" 7/1/2026, 7:19:44 AM
model"anthropic/claude-sonnet-5-20260630"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5966
moderation_latency(null)
generation_time32897
tokens_prompt46
tokens_completion496
native_tokens_prompt60
native_tokens_completion4230
native_tokens_completion_images(null)
native_tokens_reasoning304
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"
usage0.04242
router(null)
provider_responses
0
endpoint_id"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id"msg_01GLJzpbLEGbkLNMirrqSmEh"
is_byokfalse
latency3371
model_permaslug"anthropic/claude-sonnet-5-20260630"
provider_name"Amazon Bedrock"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.17.0; linux; x64))"
http_referer(null)
request_id"req-1782890384-XY6fMFlIzUnxPcenhfQE"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1782890384-utvtoX60Szi2Ew5T21bu"
upstream_id"msg_01GLJzpbLEGbkLNMirrqSmEh"
total_cost0.04242
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
sentences6
wordCounts
020
120
220
320
420
520