Run: 2026-05-29-01KSSK256KT04AFR7WM4X7SR2P

Run Details

Duration:
34.4s
Cost:
$0.094125
Provider:
Anthropic

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 autumn rain fell softly against the old manor windows as Detective Sarah Cole stepped onto the wet gravel path. Inside the dimly lit study, the body of old Lord Harrington lay sprawled across his very expensive antique Persian carpet. A single candle flickered upon the large mahogany desk casting long shadows that danced ominously across the blood-stained wooden floor. Sarah crouched beside the silent victim, carefully noting the silver letter opener buried deep inside his chest, still warm somehow. Outside, thunder rumbled across the darkening evening sky while six nervous guests waited anxiously inside the grand dining room nearby. Each one harbored dark secrets, motives, and reasons enough to want the wealthy, cruel old man permanently and conveniently removed. Detective Cole rose slowly, turning toward the open doorway where the trembling butler stood clutching a tarnished brass candlestick tightly. She knew, deep within her experienced bones, that tonight would test every single investigative skill she had ever truly mastered.
created_at"2026-05-29T10:04:16.987Z" 5/29/2026, 10:04:16 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3936
moderation_latency(null)
generation_time34005
tokens_prompt46
tokens_completion559
native_tokens_prompt60
native_tokens_completion3753
native_tokens_completion_images(null)
native_tokens_reasoning284
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"
usage0.094125
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01APMDLTmkFkU4PE8Z57XZiu"
is_byokfalse
latency1161
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780049056-maVGMfg4V2ZdjPLGsvMq"
session_id(null)
api_type"completions"
id"gen-1780049056-F3APsTwlcZVNzxYZVtvO"
upstream_id"msg_01APMDLTmkFkU4PE8Z57XZiu"
total_cost0.094125
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
720