Run: 2026-07-25-01KYCPMT27KTZ7R0S1GQD6YZ2J

Run Details

Duration:
8.8s
Cost:
$0.009750
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
51.23% 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 arrived at midnight, sliding down the windows of Thornfield House like fingers searching for a way inside. Constable Merrow parked his bicycle beneath the yew tree and stared up at the single lamp still burning. He had received the telephone call at half past eleven, a woman's voice, very calm, saying: come quickly, please. Nobody answered the front door, so he pushed it open and found the hallway smelling faintly of lavender polish. A grandfather clock ticked somewhere deeper in the house, patient as a heartbeat, counting out the seconds he wasted. The library door stood ajar, spilling yellow light across the black tiles in one long, narrow, trembling rectangle. Inside, Sir Hugh Thornfield sat in his leather armchair with a letter opener buried neatly below his left collarbone. His eyes were open, his reading glasses folded on the table, his glass of port untouched and still warm. Six people slept upstairs that night, and every one of them had written to him begging for money recently. Constable Merrow removed his helmet, wiped the rain from his face, and understood that his quiet career had ended.
created_at"2026-07-25T13:15:15.404Z" 7/25/2026, 1:15:15 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1865
moderation_latency(null)
generation_time8713
tokens_prompt46
tokens_completion288
native_tokens_prompt60
native_tokens_completion378
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"
usage0.00975
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNqXBqJYTr68ZxyZ9hvj"
is_byokfalse
latency1865
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-1784985315-Cothh2FFAahqPEQ4JCsV"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784985315-37V2dhrOzbiTskBhorDJ"
upstream_id"msg_011CdNqXBqJYTr68ZxyZ9hvj"
total_cost0.00975
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
51.23% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
019
118
219
319
419
518
619
719
819
919