Run: 2026-05-29-01KSSK5GPDFFNSR2Y8BW1EKTQX

Run Details

Duration:
21.6s
Cost:
$0.045100
Provider:
Anthropic

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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered against the old mansion's tall and dusty windows. Detective Mara Voss stepped slowly inside, shaking off the cold. A man's body lay sprawled across the cold marble floor. Blood pooled beneath him, dark and still slowly spreading outward. The grandfather clock struck midnight as she knelt down quietly. Five guests waited upstairs, none of them yet truly aware. Mara studied the victim's face and felt her stomach tighten. She recognized him instantly from the morning's troubling newspaper headline. Senator Harold Crane, found dead inside his own locked study. The heavy door had been bolted firmly from the inside. Yet someone had somehow managed to kill him regardless tonight. Mara stood up, brushing dust from her knees, frowning deeply. This would surely be the hardest case of her career.
created_at"2026-05-29T10:06:07.064Z" 5/29/2026, 10:06:07 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency7246
moderation_latency(null)
generation_time21591
tokens_prompt46
tokens_completion313
native_tokens_prompt60
native_tokens_completion1792
native_tokens_completion_images(null)
native_tokens_reasoning110
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"
usage0.0451
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01LfcroK7XbASAsBQaav5T61"
is_byokfalse
latency4567
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780049167-xjkV13gUROUw63OuEXw0"
session_id(null)
api_type"completions"
id"gen-1780049167-Fle6F7FiPQ0SCGkXmCxS"
upstream_id"msg_01LfcroK7XbASAsBQaav5T61"
total_cost0.0451
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences13
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210