Run: 2026-10-08-01M4E0C8M5QA7483HGQJWV6S1F

Run Details

Duration:
1m 58s
Cost:
$0.016522
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
90.91% 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 had been drumming against the windows of Blackwood Manor since dusk, and nobody inside had slept a wink. Inspector Margaret Hale arrived at half past one, her coat soaked and her patience worn thin by the long drive. Lord Edmund Ashworth sat slumped in his leather chair, a single crimson stain spreading steadily across his white linen shirt. The study door had been locked from inside, and the only key still hung on a chain around his neck. Constable Ross stood beside the cold fireplace, turning his hat nervously in his hands and carefully avoiding her unwavering gaze. Hale turned sharply toward Ross and said, "Nobody leaves until I have personally spoken with every soul under this roof." Across the hall, the Ashworth family had gathered in the library, whispering like nervous conspirators beneath a single dim lamp. On the desk beside the body rested a silver carriage clock, its hands stopped at precisely a quarter to midnight. Hale stepped carefully around the blood, noting the empty brandy glass, the smudged ink, and muddy footprints by the window. Tucked beneath the blotter lay an unfinished letter addressed to Inspector Hale herself, dated only three days before the murder. The first line read simply: "Margaret, if you are reading this, one of them has finally succeeded in killing me." Somewhere above, a door slammed shut, and Hale realized with a chill that the killer was still in the house.
created_at"2026-10-08T14:58:46.549Z" 10/8/2026, 2:58:46 PM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2420
moderation_latency(null)
generation_time118147
tokens_prompt46
tokens_completion4298
native_tokens_prompt62
native_tokens_completion33032
native_tokens_completion_images(null)
native_tokens_reasoning32549
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"
usage0.0165222
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791471526-G2UqAvMPEKX8NzIEJufr"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791471526-gpCBlMqQ238gYZWh8Stv"
upstream_id"msg_011Cfpy5iXWmz3gt6SrdEvg4"
provider_responses
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endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011Cfpy5iXWmz3gt6SrdEvg4"
is_byokfalse
latency790
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0165222
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
90.91% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
020
120
220
320
420
520
620
720
820
920
1040