Run: 2026-09-29-01M3P2APXAKQ1H07WDVB7Q5D3E

Run Details

Duration:
17.2s
Cost:
$0.022774
Provider:
Claude Platform on AWS

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
Rain hammered the windows of Blackwood Manor the night Lord Alistair Finch was found dead in his own locked study. Inspector Mara Quinn arrived after midnight, her boots soaked, her patience thinner than the fog curling across the gravel drive. The butler, a stooped man named Hobbs, met her at the door and whispered that nobody had touched anything, ma'am. Inside the study, Finch slumped over his mahogany desk, one hand outstretched toward a porcelain teacup that had not spilled. The heavy oak door had been bolted from the inside, and the only tall window was painted shut decades ago. Quinn knelt beside the body and noticed a faint, bitter smell of almonds still clinging to the dead man's collar. Behind her, the family gathered in the doorway: a pale widow, a nephew, a physician, and a silent young secretary. Every one of them claimed to have heard nothing, yet somebody had wound the old clock on the mantel backward. Quinn straightened slowly, studied each face in turn, and felt certain that the killer was still standing within arm's reach.
created_at"2026-09-29T07:51:06.419Z" 9/29/2026, 7:51:06 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3897
moderation_latency(null)
generation_time17150
tokens_prompt46
tokens_completion538
native_tokens_prompt62
native_tokens_completion2265
native_tokens_completion_images(null)
native_tokens_reasoning1902
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"
usage0.022774
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668266-eX3tbpBaihVjhjm2tnPg"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668266-T8CmRoXSEq8CQpgQakwz"
upstream_id"msg_011CfXNBx2tqaUBQajrqK2Lo"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNBx2tqaUBQajrqK2Lo"
is_byokfalse
latency695
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.022774
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
100.00% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
020
120
220
320
420
520
620
720
820