Run: 2026-06-01-01KT1H70ES983W0H1E90TSN0J9

Run Details

Duration:
22.3s
Cost:
$0.061400
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 softly against the tall windows of Ravenswood Manor as Detective Sarah Holloway slowly stepped through the door. Inside the grand entrance foyer, a single bright chandelier flickered above the lifeless body sprawled across the cold marble floor. The victim, a very wealthy old man named Edmund Crane, clutched a torn letter tightly within his stiffened right hand. Sarah knelt down beside him, careful not to disturb anything, and studied the faint crimson stain blooming across his shirt. A tall grandfather clock chimed midnight loudly while the storm outside grew fiercer, rattling the ancient panes of every window. Somewhere upstairs, a loose floorboard creaked beneath unseen footsteps, reminding Sarah that the killer might still be inside this house.
created_at"2026-06-01T12:05:54.269Z" 6/1/2026, 12:05:54 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3126
moderation_latency(null)
generation_time22252
tokens_prompt46
tokens_completion398
native_tokens_prompt60
native_tokens_completion2444
native_tokens_completion_images(null)
native_tokens_reasoning196
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"
usage0.0614
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01BCaa5cJpTVLSJsNGwMfuVx"
is_byokfalse
latency1011
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-1780315554-UF8Y4nrJRXg0mF8fxmkJ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780315554-3wFEAkazx0wa4kNcdvO6"
upstream_id"msg_01BCaa5cJpTVLSJsNGwMfuVx"
total_cost0.0614
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
sentences6
wordCounts
020
120
220
320
420
520