Run: 2026-09-23-01M37PQ1NREFXMPAJP3X9JY5J7

Run Details

Duration:
18.8s
Cost:
$0.037128
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
The rain had not stopped for three days when Inspector Clara Voss arrived at the iron gates of Harrowgate Manor. A young constable waited beneath a black umbrella, his face pale, his hands trembling as he opened her car door. "The body is in the library, ma'am," he whispered, as though the dead man might somehow still overhear them talking. Clara stepped inside, shaking water from her coat, and noticed immediately that every clock in the hallway had been stopped. Each one showed the same time, a quarter past midnight, their brass hands frozen like silent witnesses refusing to speak. In the library, Lord Edmund Harrow sat slumped in his leather armchair, a glass of brandy still in his hand. His eyes were open, fixed upon the portrait of his late wife that hung above the cold grey stone fireplace. Four members of the household had gathered by the window, and Clara sensed that at least one was already lying. "Nobody touched him," the butler said stiffly, but Clara saw the faint red smear of lipstick on the brandy glass.
created_at"2026-09-23T17:58:45.706Z" 9/23/2026, 5:58:45 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4918
moderation_latency(null)
generation_time18738
tokens_prompt46
tokens_completion564
native_tokens_prompt62
native_tokens_completion1844
native_tokens_completion_images(null)
native_tokens_reasoning1498
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"
usage0.037128
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186325-ptsUxqlyUgAyACQmkzlF"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186325-uVFYwx4lnNUawfyDVNtb"
upstream_id"msg_011CfLog3KY23GMyEiLZXdz9"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLog3KY23GMyEiLZXdz9"
is_byokfalse
latency1566
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.037128
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