Run: 2026-07-25-01KYCRMBD1FYS9TW11V73TDXCW

Run Details

Duration:
25.7s
Cost:
$0.062075
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 Ravenscourt House since midnight, and by dawn the gravel drive resembled a shallow river. Mrs. Halloway found the library door locked at seven, which had never happened in her thirty years of service here. She knocked twice, listened, then set her tray down and pressed one ear flat against the cold dark oak panel. Inside, something ticked steadily, and beneath that ticking she heard nothing at all, no breath, no chair, no turning page. The master of the house had a rule about the library, absolute and unbending: nobody entered it before nine o'clock. Mrs. Halloway broke that rule at eight minutes past seven, using the spare key hidden inside the tall hall clock. Sir Edmund Vane sat in his chair facing the window, and the back of his silver head was terribly wrong. The tray fell, the china shattered, and forty years of careful silence left her throat in one long thin scream. Outside, the rain kept falling, erasing whatever footprints the killer had left across the drive before the dawn had come. By eight, three cars had come, and every person inside Ravenscourt House was already quietly deciding exactly what to conceal.
created_at"2026-07-25T13:49:57.568Z" 7/25/2026, 1:49:57 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4052
moderation_latency(null)
generation_time25534
tokens_prompt46
tokens_completion567
native_tokens_prompt60
native_tokens_completion2471
native_tokens_completion_images(null)
native_tokens_reasoning275
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"
usage0.062075
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNtAfkqu6ibFrMz9pGfB"
is_byokfalse
latency1512
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-1784987397-GgramPzPWq1Jw71D7LjB"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784987397-MuaYL4FFAUZXK27E25d5"
upstream_id"msg_011CdNtAfkqu6ibFrMz9pGfB"
total_cost0.062075
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