Run: 2026-05-31-01KSYXPV6BP25BWXSD2GT56HS5

Run Details

Duration:
33.8s
Cost:
$0.090975
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 rain fell hard against the old manor windows as Detective Sarah Hayes stepped carefully across the dusty threshold inside. A single dim chandelier flickered overhead, casting long shadows that danced nervously along the cracked walls and cold marble floor. There, sprawled beneath the grand staircase, lay the body of the wealthy old patriarch Edward Crowley, his eyes wide open. Blood pooled darkly across the white marble, spreading slowly toward the fallen silver candlestick lying near his cold outstretched hand. Sarah knelt down, her gloved fingers hovering just above the open wound, knowing immediately this meant deliberate, cold, calculated murder. Behind her, the assembled houseguests gathered silently in the doorway, their pale faces frozen between genuine shock and quiet guilt. Someone in this very room had murdered Edward Crowley tonight, and Sarah intended to discover exactly who before sunrise came.
created_at"2026-05-31T11:46:32.791Z" 5/31/2026, 11:46:32 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4087
moderation_latency(null)
generation_time33794
tokens_prompt46
tokens_completion513
native_tokens_prompt60
native_tokens_completion3627
native_tokens_completion_images(null)
native_tokens_reasoning271
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"
usage0.090975
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01J6ndPAEAkeh9XT2pTux6Ht"
is_byokfalse
latency1426
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-1780227992-Bcq9ySx0BDJCYl5Otg3l"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227992-VTTuYV3OjId8AUG41e2R"
upstream_id"msg_01J6ndPAEAkeh9XT2pTux6Ht"
total_cost0.090975
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
sentences7
wordCounts
020
120
220
320
420
520
620