Run: 2026-10-08-01M4DYEENZY6RTAD9H462T5KK4

Run Details

Duration:
1m 14s
Cost:
$0.010223
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 been falling over Blackmoor Manor since dusk, turning the gravel drive into a river of silver mud. Inside the dim study, the tall grandfather clock struck eleven just as Inspector Helen Marsh stepped quietly across the threshold. The body of Lord Edmund Ashworth lay sprawled beside the cold fireplace, one hand still clutching a broken crystal tumbler. Seven guests were stranded within the manor tonight, and every single one of them had a strong motive for murder. Helen knelt beside the corpse, carefully noting the faint smell of bitter almonds that clung to his slightly parted lips. Behind her, the butler swore that nobody had left the house since dinner, though his trembling hands told another story. Tucked neatly beside an empty decanter lay a single white glove, its twin nowhere to be found in the mansion. Helen promptly sealed the glove in an evidence bag, certain that the killer had made one fatal mistake that night. Then, from somewhere high above them, a door slammed shut, and a woman's terrified scream echoed through the silent halls.
created_at"2026-10-08T14:25:01.129Z" 10/8/2026, 2:25:01 PM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency45413
moderation_latency(null)
generation_time73746
tokens_prompt46
tokens_completion2542
native_tokens_prompt62
native_tokens_completion20434
native_tokens_completion_images(null)
native_tokens_reasoning20068
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"
usage0.0102232
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791469501-UiTS5190LyoHMHgBxAkF"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791469501-C3LusA1biytBy6AiHMwc"
upstream_id"msg_011CfpvWR1QbKwUpZkVATRy5"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpvWR1QbKwUpZkVATRy5"
is_byokfalse
latency831
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0102232
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