Run: 2026-07-25-01KYCPXJ2QXVYZZYYSGP4TK92Y

Run Details

Duration:
10.1s
Cost:
$0.010025
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
68.52% 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
Rain hammered the slate roof of Thornbury Hall while the guests pretended not to notice the empty chair at dinner. Lady Margaret Ashcombe raised her glass, and the candlelight caught a tremor she had never permitted anyone to witness. "He is merely delayed," she announced, though the storm had closed the only road three hours before the soup arrived. Across the table, Dr. Elias Wren studied his reflection in a silver spoon and decided the truth could wait. The butler, Havers, entered without knocking, which in thirty-one years of faithful service he had never once done before. He bent to whisper, and Lady Margaret's glass met the tablecloth with a sound like a small bone breaking. Nobody spoke, because the words had already arrived in the room ahead of him, uninvited, wearing everyone's private suspicions. "The boathouse," Havers said finally, and his voice cracked open on the second syllable like ice under a boot. Six people rose together, and six shadows lurched across the portraits of ancestors who had kept far better secrets. Outside, the rain washed the gravel path clean of every footprint except the ones leading down toward the water.
created_at"2026-07-25T13:20:02.14Z" 7/25/2026, 1:20:02 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2311
moderation_latency(null)
generation_time10012
tokens_prompt46
tokens_completion297
native_tokens_prompt60
native_tokens_completion389
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"
usage0.010025
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNqtKpMXLpaSVNUVPhkM"
is_byokfalse
latency2299
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-1784985602-bw7glaxbdxx6PbDMYU3R"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784985602-YmEFwJXrrmzGBPu1wW0c"
upstream_id"msg_011CdNqtKpMXLpaSVNUVPhkM"
total_cost0.010025
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
68.52% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
020
119
220
319
419
519
619
719
819
919