Run: 2026-10-09-01M4FYY12RY5921BZCWQ4RZ7X3

Run Details

Duration:
12.4s
Cost:
$0.001266
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
93.44% 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 relentless rain fell steadily over Ashford Manor on the cold night Lord Thorne was found dead in his study. Inspector Mabel Greaves arrived at half past eleven, her umbrella dripping onto the polished oak floorboards of the hallway. Nobody in the household had heard a single gunshot, though three guests swore they saw lanterns moving outside after midnight. Every suspect had a motive, and every motive, Greaves suspected, had been carefully hidden behind practiced, courteous smiles for years. Greaves removed her gloves, knelt beside the body, and noticed the brass key clutched tightly in its cold right hand. Somewhere in the house, a clock struck midnight, and then the housekeeper began to scream uncontrollably from the upstairs landing.
created_at"2026-10-09T09:12:00.355Z" 10/9/2026, 9:12:00 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2008
moderation_latency(null)
generation_time12364
tokens_prompt46
tokens_completion456
native_tokens_prompt62
native_tokens_completion2519
native_tokens_completion_images(null)
native_tokens_reasoning2260
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"
usage0.0012657
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791537120-n0crthTMViFFgMTyD0ZI"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791537120-0GYEvFXOkwX7nG5mTAbw"
upstream_id"msg_011CfrQSuwModDGTRW5rMMQG"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfrQSuwModDGTRW5rMMQG"
is_byokfalse
latency728
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0012657
cache_discount(null)
upstream_inference_cost0
provider_name"Claude Platform on AWS"
response_cache_source_id(null)
data_region"global"
workspace_id"97e315e5-d303-487d-83c1-83180e8a13d4"

Evaluation details

Result Evaluator Details Meta Data
93.44% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
119
220
320
420
520